test-sequence.js
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
let { seq, iterate, filter, map, reductions, reduce, count,
isEmpty, every, isEvery, some, take, takeWhile, drop,
dropWhile, concat, first, rest, nth, last, dropLast,
distinct, remove, mapcat, fromEnumerator, string,
object, pairs, keys, values, each
} = require("sdk/util/sequence");
const boom = () => { throw new Error("Boom!"); };
const broken = seq(function*() {
yield 1;
throw new Error("Boom!");
});
exports["test seq"] = assert => {
let xs = seq(function*() {
yield 1;
yield 2;
yield 3;
});
assert.deepEqual([...seq(null)], [], "seq of null is empty");
assert.deepEqual([...seq(void(0))], [], "seq of void is empty");
assert.deepEqual([...xs], [1, 2, 3], "seq of 1 2 3");
assert.deepEqual([...seq(xs)], [1, 2, 3], "seq of seq is seq");
assert.deepEqual([...seq([])], [], "seq of emtpy array is empty");
assert.deepEqual([...seq([1])], [1], "seq of lonly array is single element");
assert.deepEqual([...seq([1, 2, 3])], [1, 2, 3], "seq of array is it's elements");
assert.deepEqual([...seq("")], [], "seq of emtpy string is empty");
assert.deepEqual([...seq("o")], ["o"], "seq of char is single char seq");
assert.deepEqual([...seq("hello")], ["h", "e", "l", "l", "o"],
"seq of string are chars");
assert.deepEqual([...seq(new Set())], [], "seq of emtpy set is empty");
assert.deepEqual([...seq(new Set([1]))], [1], "seq of lonely set is single");
assert.deepEqual([...seq(new Set([1, 2, 3]))], [1, 2, 3], "seq of lonely set is single");
assert.deepEqual([...seq(new Map())], [], "seq of emtpy map is empty");
assert.deepEqual([...seq(new Map([[1, 2]]))], [[1, 2]], "seq single mapping is that mapping");
assert.deepEqual([...seq(new Map([[1, 2], [3, 4], [5, 6]]))],
[[1, 2], [3, 4], [5, 6]],
"seq of map is key value mappings");
[function(){}, 1, /foo/, true].forEach(x => {
assert.throws(() => seq(x), "Type is not seq-able");
});
assert.throws(() => [...broken],
/Boom/,
"broken sequence errors propagate");
};
exports["test seq casting"] = assert => {
const xs = seq(function*() { yield 1; yield 2; yield 3; });
const ys = seq(function*() { yield 1; });
const zs = seq(function*() {});
const kvs = seq(function*() { yield ["a", 1]; yield ["b", 2]; });
const kv = seq(function*() { yield ["a", 1]; });
assert.deepEqual([...xs], [1, 2, 3], "cast to array");
assert.deepEqual([...ys], [1], "cast to of one element");
assert.deepEqual([...zs], [], "cast empty array");
assert.deepEqual(string(...xs), "123", "cast to string");
assert.deepEqual(string(...ys), "1", "cast to char");
assert.deepEqual(string(...zs), "", "cast to empty string");
assert.deepEqual(new Set(xs), new Set([1, 2, 3]),
"cast to set of items");
assert.deepEqual(new Set(ys), new Set([1]),
"cast to set of one item");
assert.deepEqual(new Set(zs), new Set(),
"cast to set of one item");
assert.deepEqual(new Map(kvs), new Map([["a", 1], ["b", 2]]),
"cast to map");
assert.deepEqual(new Map(kv), new Map([["a", 1]]),
"cast to single mapping");
assert.deepEqual(new Map(zs), new Map(),
"cast to empty map");
assert.deepEqual(object(...kvs), {a: 1, b: 2},
"cast to object");
assert.deepEqual(object(...kv), {a: 1},
"cast to single pair");
assert.deepEqual(object(...zs), {},
"cast to empty object");
};
exports["test pairs"] = assert => {
assert.deepEqual([...pairs(null)], [], "pairs on null is empty");
assert.deepEqual([...pairs(void(0))], [], "pairs on void is empty");
assert.deepEqual([...pairs({})], [], "empty sequence");
assert.deepEqual([...pairs({a: 1})], [["a", 1]], "single pair");
assert.deepEqual([...pairs({a: 1, b: 2, c: 3})].sort(),
[["a", 1], ["b", 2], ["c", 3]],
"creates pairs");
let items = [];
for (let [key, value] of pairs({a: 1, b: 2, c: 3}))
items.push([key, value]);
assert.deepEqual(items.sort(),
[["a", 1], ["b", 2], ["c", 3]],
"for of works on pairs");
assert.deepEqual([...pairs([])], [], "pairs on empty array is empty");
assert.deepEqual([...pairs([1])], [[0, 1]], "pairs on array is [index, element]");
assert.deepEqual([...pairs([1, 2, 3])],
[[0, 1], [1, 2], [2, 3]],
"for arrays it pair of [index, element]");
assert.deepEqual([...pairs("")], [], "pairs on empty string is empty");
assert.deepEqual([...pairs("a")], [[0, "a"]], "pairs on char is [0, char]");
assert.deepEqual([...pairs("hello")],
[[0, "h"], [1, "e"], [2, "l"], [3, "l"], [4, "o"]],
"for strings it's pair of [index, char]");
assert.deepEqual([...pairs(new Map())],
[],
"pairs on empty map is empty");
assert.deepEqual([...pairs(new Map([[1, 3]]))],
[[1, 3]],
"pairs on single mapping single mapping");
assert.deepEqual([...pairs(new Map([[1, 2], [3, 4]]))],
[[1, 2], [3, 4]],
"pairs on map returs key vaule pairs");
assert.throws(() => pairs(new Set()),
"can't pair set");
assert.throws(() => pairs(4),
"can't pair number");
assert.throws(() => pairs(true),
"can't pair boolean");
};
exports["test keys"] = assert => {
assert.deepEqual([...keys(null)], [], "keys on null is empty");
assert.deepEqual([...keys(void(0))], [], "keys on void is empty");
assert.deepEqual([...keys({})], [], "empty sequence");
assert.deepEqual([...keys({a: 1})], ["a"], "single key");
assert.deepEqual([...keys({a: 1, b: 2, c: 3})].sort(),
["a", "b", "c"],
"all keys");
let items = [];
for (let key of keys({a: 1, b: 2, c: 3}))
items.push(key);
assert.deepEqual(items.sort(),
["a", "b", "c"],
"for of works on keys");
assert.deepEqual([...keys([])], [], "keys on empty array is empty");
assert.deepEqual([...keys([1])], [0], "keys on array is indexes");
assert.deepEqual([...keys([1, 2, 3])],
[0, 1, 2],
"keys on arrays returns indexes");
assert.deepEqual([...keys("")], [], "keys on empty string is empty");
assert.deepEqual([...keys("a")], [0], "keys on char is 0");
assert.deepEqual([...keys("hello")],
[0, 1, 2, 3, 4],
"keys on strings is char indexes");
assert.deepEqual([...keys(new Map())],
[],
"keys on empty map is empty");
assert.deepEqual([...keys(new Map([[1, 3]]))],
[1],
"keys on single mapping single mapping is single key");
assert.deepEqual([...keys(new Map([[1, 2], [3, 4]]))],
[1, 3],
"keys on map is keys from map");
assert.throws(() => keys(new Set()),
"can't keys set");
assert.throws(() => keys(4),
"can't keys number");
assert.throws(() => keys(true),
"can't keys boolean");
};
exports["test values"] = assert => {
assert.deepEqual([...values({})], [], "empty sequence");
assert.deepEqual([...values({a: 1})], [1], "single value");
assert.deepEqual([...values({a: 1, b: 2, c: 3})].sort(),
[1, 2, 3],
"all values");
let items = [];
for (let value of values({a: 1, b: 2, c: 3}))
items.push(value);
assert.deepEqual(items.sort(),
[1, 2, 3],
"for of works on values");
assert.deepEqual([...values([])], [], "values on empty array is empty");
assert.deepEqual([...values([1])], [1], "values on array elements");
assert.deepEqual([...values([1, 2, 3])],
[1, 2, 3],
"values on arrays returns elements");
assert.deepEqual([...values("")], [], "values on empty string is empty");
assert.deepEqual([...values("a")], ["a"], "values on char is char");
assert.deepEqual([...values("hello")],
["h", "e", "l", "l", "o"],
"values on strings is chars");
assert.deepEqual([...values(new Map())],
[],
"values on empty map is empty");
assert.deepEqual([...values(new Map([[1, 3]]))],
[3],
"keys on single mapping single mapping is single key");
assert.deepEqual([...values(new Map([[1, 2], [3, 4]]))],
[2, 4],
"values on map is values from map");
assert.deepEqual([...values(new Set())], [], "values on empty set is empty");
assert.deepEqual([...values(new Set([1]))], [1], "values on set is it's items");
assert.deepEqual([...values(new Set([1, 2, 3]))],
[1, 2, 3],
"values on set is it's items");
assert.throws(() => values(4),
"can't values number");
assert.throws(() => values(true),
"can't values boolean");
};
exports["test fromEnumerator"] = assert => {
const { Cc, Ci } = require("chrome");
const { enumerateObservers,
addObserver,
removeObserver } = Cc["@mozilla.org/observer-service;1"].
getService(Ci.nsIObserverService);
const topic = "sec:" + Math.random().toString(32).substr(2);
const [a, b, c] = [{wrappedJSObject: {}},
{wrappedJSObject: {}},
{wrappedJSObject: {}}];
const unwrap = x => x.wrappedJSObject;
[a, b, c].forEach(x => addObserver(x, topic, false));
const xs = fromEnumerator(() => enumerateObservers(topic));
const ys = map(unwrap, xs);
assert.deepEqual([...ys], [a, b, c].map(unwrap),
"all observers are there");
removeObserver(b, topic);
assert.deepEqual([...ys], [a, c].map(unwrap),
"b was removed");
removeObserver(a, topic);
assert.deepEqual([...ys], [c].map(unwrap),
"a was removed");
removeObserver(c, topic);
assert.deepEqual([...ys], [],
"c was removed, now empty");
addObserver(a, topic, false);
assert.deepEqual([...ys], [a].map(unwrap),
"a was added");
removeObserver(a, topic);
assert.deepEqual([...ys], [].map(unwrap),
"a was removed, now empty");
};
exports["test filter"] = assert => {
const isOdd = x => x % 2;
const odds = seq(function*() { yield 1; yield 3; yield 5; });
const evens = seq(function*() { yield 2; yield 4; yield 6; });
const mixed = seq(function*() {
yield 1;
yield 2;
yield 3;
yield 4;
});
assert.deepEqual([...filter(isOdd, mixed)], [1, 3],
"filtered odds");
assert.deepEqual([...filter(isOdd, odds)], [1, 3, 5],
"kept all");
assert.deepEqual([...filter(isOdd, evens)], [],
"kept none");
let xs = filter(boom, mixed);
assert.throws(() => [...xs], /Boom/, "errors propagate");
assert.throws(() => [...filter(isOdd, broken)], /Boom/,
"sequence errors propagate");
};
exports["test filter array"] = assert => {
let isOdd = x => x % 2;
let xs = filter(isOdd, [1, 2, 3, 4]);
let ys = filter(isOdd, [1, 3, 5]);
let zs = filter(isOdd, [2, 4, 6]);
assert.deepEqual([...xs], [1, 3], "filteres odds");
assert.deepEqual([...ys], [1, 3, 5], "kept all");
assert.deepEqual([...zs], [], "kept none");
assert.ok(!Array.isArray(xs));
};
exports["test filter set"] = assert => {
let isOdd = x => x % 2;
let xs = filter(isOdd, new Set([1, 2, 3, 4]));
let ys = filter(isOdd, new Set([1, 3, 5]));
let zs = filter(isOdd, new Set([2, 4, 6]));
assert.deepEqual([...xs], [1, 3], "filteres odds");
assert.deepEqual([...ys], [1, 3, 5], "kept all");
assert.deepEqual([...zs], [], "kept none");
};
exports["test filter string"] = assert => {
let isUpperCase = x => x.toUpperCase() === x;
let xs = filter(isUpperCase, "aBcDe");
let ys = filter(isUpperCase, "ABC");
let zs = filter(isUpperCase, "abcd");
assert.deepEqual([...xs], ["B", "D"], "filteres odds");
assert.deepEqual([...ys], ["A", "B", "C"], "kept all");
assert.deepEqual([...zs], [], "kept none");
};
exports["test filter lazy"] = assert => {
const x = 1;
let y = 2;
const xy = seq(function*() { yield x; yield y; });
const isOdd = x => x % 2;
const actual = filter(isOdd, xy);
assert.deepEqual([...actual], [1], "only one odd number");
y = 3;
assert.deepEqual([...actual], [1, 3], "filter is lazy");
};
exports["test filter non sequences"] = assert => {
const False = _ => false;
assert.throws(() => [...filter(False, 1)],
"can't iterate number");
assert.throws(() => [...filter(False, {a: 1, b:2})],
"can't iterate object");
};
exports["test map"] = assert => {
let inc = x => x + 1;
let xs = seq(function*() { yield 1; yield 2; yield 3; });
let ys = map(inc, xs);
assert.deepEqual([...ys], [2, 3, 4], "incremented each item");
assert.deepEqual([...map(inc, null)], [], "mapping null is empty");
assert.deepEqual([...map(inc, void(0))], [], "mapping void is empty");
assert.deepEqual([...map(inc, new Set([1, 2, 3]))], [2, 3, 4], "maps set items");
};
exports["test map two inputs"] = assert => {
let sum = (x, y) => x + y;
let xs = seq(function*() { yield 1; yield 2; yield 3; });
let ys = seq(function*() { yield 4; yield 5; yield 6; });
let zs = map(sum, xs, ys);
assert.deepEqual([...zs], [5, 7, 9], "summed numbers");
};
exports["test map diff sized inputs"] = assert => {
let sum = (x, y) => x + y;
let xs = seq(function*() { yield 1; yield 2; yield 3; });
let ys = seq(function*() { yield 4; yield 5; yield 6; yield 7; yield 8; });
let zs = map(sum, xs, ys);
assert.deepEqual([...zs], [5, 7, 9], "summed numbers");
assert.deepEqual([...map(sum, ys, xs)], [5, 7, 9],
"index of exhasting input is irrelevant");
};
exports["test map multi"] = assert => {
let sum = (x, y, z, w) => x + y + z + w;
let xs = seq(function*() { yield 1; yield 2; yield 3; yield 4; });
let ys = seq(function*() { yield 4; yield 5; yield 6; yield 7; yield 8; });
let zs = seq(function*() { yield 10; yield 11; yield 12; });
let ws = seq(function*() { yield 0; yield 20; yield 40; yield 60; });
let actual = map(sum, xs, ys, zs, ws);
assert.deepEqual([...actual], [15, 38, 61], "summed numbers");
};
exports["test map errors"] = assert => {
assert.deepEqual([...map(boom, [])], [],
"won't throw if empty");
const xs = map(boom, [1, 2, 4]);
assert.throws(() => [...xs], /Boom/, "propagates errors");
assert.throws(() => [...map(x => x, broken)], /Boom/,
"sequence errors propagate");
};
exports["test reductions"] = assert => {
let sum = (...xs) => xs.reduce((x, y) => x + y, 0);
assert.deepEqual([...reductions(sum, [1, 1, 1, 1])],
[1, 2, 3, 4],
"works with arrays");
assert.deepEqual([...reductions(sum, 5, [1, 1, 1, 1])],
[5, 6, 7, 8, 9],
"array with initial");
assert.deepEqual([...reductions(sum, seq(function*() {
yield 1;
yield 2;
yield 3;
}))],
[1, 3, 6],
"works with sequences");
assert.deepEqual([...reductions(sum, 10, seq(function*() {
yield 1;
yield 2;
yield 3;
}))],
[10, 11, 13, 16],
"works with sequences");
assert.deepEqual([...reductions(sum, [])], [0],
"invokes accumulator with no args");
assert.throws(() => [...reductions(boom, 1, [1])],
/Boom/,
"arg errors errors propagate");
assert.throws(() => [...reductions(sum, 1, broken)],
/Boom/,
"sequence errors propagate");
};
exports["test reduce"] = assert => {
let sum = (...xs) => xs.reduce((x, y) => x + y, 0);
assert.deepEqual(reduce(sum, [1, 2, 3, 4, 5]),
15,
"works with arrays");
assert.deepEqual(reduce(sum, seq(function*() {
yield 1;
yield 2;
yield 3;
})),
6,
"works with sequences");
assert.deepEqual(reduce(sum, 10, [1, 2, 3, 4, 5]),
25,
"works with array & initial");
assert.deepEqual(reduce(sum, 5, seq(function*() {
yield 1;
yield 2;
yield 3;
})),
11,
"works with sequences & initial");
assert.deepEqual(reduce(sum, []), 0, "reduce with no args");
assert.deepEqual(reduce(sum, "a", []), "a", "reduce with initial");
assert.deepEqual(reduce(sum, 1, [1]), 2, "reduce with single & initial");
assert.throws(() => [...reduce(boom, 1, [1])],
/Boom/,
"arg errors errors propagate");
assert.throws(() => [...reduce(sum, 1, broken)],
/Boom/,
"sequence errors propagate");
};
exports["test each"] = assert => {
const collect = xs => {
let result = [];
each((...etc) => result.push(...etc), xs);
return result;
};
assert.deepEqual(collect(null), [], "each ignores null");
assert.deepEqual(collect(void(0)), [], "each ignores void");
assert.deepEqual(collect([]), [], "each ignores empty");
assert.deepEqual(collect([1]), [1], "each works on single item arrays");
assert.deepEqual(collect([1, 2, 3, 4, 5]),
[1, 2, 3, 4, 5],
"works with arrays");
assert.deepEqual(collect(seq(function*() {
yield 1;
yield 2;
yield 3;
})),
[1, 2, 3],
"works with sequences");
assert.deepEqual(collect(""), [], "ignores empty strings");
assert.deepEqual(collect("a"), ["a"], "works on chars");
assert.deepEqual(collect("hello"), ["h", "e", "l", "l", "o"],
"works on strings");
assert.deepEqual(collect(new Set()), [], "ignores empty sets");
assert.deepEqual(collect(new Set(["a"])), ["a"],
"works on single item sets");
assert.deepEqual(collect(new Set([1, 2, 3])), [1, 2, 3],
"works on muti item tests");
assert.deepEqual(collect(new Map()), [], "ignores empty maps");
assert.deepEqual(collect(new Map([["a", 1]])), [["a", 1]],
"works on single mapping maps");
assert.deepEqual(collect(new Map([[1, 2], [3, 4], [5, 6]])),
[[1, 2], [3, 4], [5, 6]],
"works on muti mapping maps");
assert.throws(() => collect({}), "objects arn't supported");
assert.throws(() => collect(1), "numbers arn't supported");
assert.throws(() => collect(true), "booleas arn't supported");
};
exports["test count"] = assert => {
assert.equal(count(null), 0, "null counts to 0");
assert.equal(count(), 0, "undefined counts to 0");
assert.equal(count([]), 0, "empty array");
assert.equal(count([1, 2, 3]), 3, "non-empty array");
assert.equal(count(""), 0, "empty string");
assert.equal(count("hello"), 5, "non-empty string");
assert.equal(count(new Map()), 0, "empty map");
assert.equal(count(new Map([[1, 2], [2, 3]])), 2, "non-empty map");
assert.equal(count(new Set()), 0, "empty set");
assert.equal(count(new Set([1, 2, 3, 4])), 4, "non-empty set");
assert.equal(count(seq(function*() {})), 0, "empty sequence");
assert.equal(count(seq(function*() { yield 1; yield 2; })), 2,
"non-empty sequence");
assert.throws(() => count(broken),
/Boom/,
"sequence errors propagate");
};
exports["test isEmpty"] = assert => {
assert.equal(isEmpty(null), true, "null is empty");
assert.equal(isEmpty(), true, "undefined is empty");
assert.equal(isEmpty([]), true, "array is array");
assert.equal(isEmpty([1, 2, 3]), false, "array isn't empty");
assert.equal(isEmpty(""), true, "string is empty");
assert.equal(isEmpty("hello"), false, "non-empty string");
assert.equal(isEmpty(new Map()), true, "empty map");
assert.equal(isEmpty(new Map([[1, 2], [2, 3]])), false, "non-empty map");
assert.equal(isEmpty(new Set()), true, "empty set");
assert.equal(isEmpty(new Set([1, 2, 3, 4])), false , "non-empty set");
assert.equal(isEmpty(seq(function*() {})), true, "empty sequence");
assert.equal(isEmpty(seq(function*() { yield 1; yield 2; })), false,
"non-empty sequence");
assert.equal(isEmpty(broken), false, "hasn't reached error");
};
exports["test isEvery"] = assert => {
let isOdd = x => x % 2;
let isTrue = x => x === true;
let isFalse = x => x === false;
assert.equal(isEvery(isOdd, seq(function*() {
yield 1;
yield 3;
yield 5;
})), true, "all are odds");
assert.equal(isEvery(isOdd, seq(function*() {
yield 1;
yield 2;
yield 3;
})), false, "contains even");
assert.equal(isEvery(isTrue, seq(function*() {})), true, "true if empty");
assert.equal(isEvery(isFalse, seq(function*() {})), true, "true if empty");
assert.equal(isEvery(isTrue, null), true, "true for null");
assert.equal(isEvery(isTrue, undefined), true, "true for undefined");
assert.throws(() => isEvery(boom, [1, 2]),
/Boom/,
"arg errors errors propagate");
assert.throws(() => isEvery(x => true, broken),
/Boom/,
"sequence errors propagate");
assert.equal(isEvery(x => false, broken), false,
"hasn't reached error");
};
exports["test some"] = assert => {
let isOdd = x => x % 2;
let isTrue = x => x === true;
let isFalse = x => x === false;
assert.equal(some(isOdd, seq(function*() {
yield 2;
yield 4;
yield 6;
})), null, "all are even");
assert.equal(some(isOdd, seq(function*() {
yield 2;
yield 3;
yield 4;
})), true, "contains odd");
assert.equal(some(isTrue, seq(function*() {})), null,
"null if empty")
assert.equal(some(isFalse, seq(function*() {})), null,
"null if empty")
assert.equal(some(isTrue, null), null, "null for null");
assert.equal(some(isTrue, undefined), null, "null for undefined");
assert.throws(() => some(boom, [1, 2]),
/Boom/,
"arg errors errors propagate");
assert.throws(() => some(x => false, broken),
/Boom/,
"sequence errors propagate");
assert.equal(some(x => true, broken), true,
"hasn't reached error");
};
exports["test take"] = assert => {
let xs = seq(function*() {
yield 1;
yield 2;
yield 3;
yield 4;
yield 5;
yield 6;
});
assert.deepEqual([...take(3, xs)], [1, 2, 3], "took 3 items");
assert.deepEqual([...take(3, [1, 2, 3, 4, 5])], [1, 2, 3],
"took 3 from array");
let ys = seq(function*() { yield 1; yield 2; });
assert.deepEqual([...take(3, ys)], [1, 2], "takes at max n");
assert.deepEqual([...take(3, [1, 2])], [1, 2],
"takes at max n from arary");
let empty = seq(function*() {});
assert.deepEqual([...take(5, empty)], [], "nothing to take");
assert.throws(() => [...take(3, broken)],
/Boom/,
"sequence errors propagate");
assert.deepEqual([...take(1, broken)], [1],
"hasn't reached error");
};
exports["test iterate"] = assert => {
let inc = x => x + 1;
let nums = iterate(inc, 0);
assert.deepEqual([...take(5, nums)], [0, 1, 2, 3, 4], "took 5");
assert.deepEqual([...take(10, nums)], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], "took 10");
let xs = iterate(x => x * 3, 2);
assert.deepEqual([...take(4, xs)], [2, 6, 18, 54], "took 4");
assert.throws(() => [...iterate(boom, 0)],
/Boom/,
"function exceptions propagate");
};
exports["test takeWhile"] = assert => {
let isNegative = x => x < 0;
let xs = seq(function*() {
yield -2;
yield -1;
yield 0;
yield 1;
yield 2;
yield 3;
});
assert.deepEqual([...takeWhile(isNegative, xs)], [-2, -1],
"took until 0");
let ys = seq(function*() {});
assert.deepEqual([...takeWhile(isNegative, ys)], [],
"took none");
let zs = seq(function*() {
yield 0;
yield 1;
yield 2;
yield 3;
});
assert.deepEqual([...takeWhile(isNegative, zs)], [],
"took none");
assert.throws(() => [...takeWhile(boom, zs)],
/Boom/,
"function errors errors propagate");
assert.throws(() => [...takeWhile(x => true, broken)],
/Boom/,
"sequence errors propagate");
assert.deepEqual([...takeWhile(x => false, broken)],
[],
"hasn't reached error");
};
exports["test drop"] = assert => {
let testDrop = xs => {
assert.deepEqual([...drop(2, xs)],
[3, 4],
"dropped two elements");
assert.deepEqual([...drop(1, xs)],
[2, 3, 4],
"dropped one");
assert.deepEqual([...drop(0, xs)],
[1, 2, 3, 4],
"dropped 0");
assert.deepEqual([...drop(-2, xs)],
[1, 2, 3, 4],
"dropped 0 on negative `n`");
assert.deepEqual([...drop(5, xs)],
[],
"dropped all items");
};
testDrop([1, 2, 3, 4]);
testDrop(seq(function*() {
yield 1;
yield 2;
yield 3;
yield 4;
}));
assert.throws(() => [...drop(1, broken)],
/Boom/,
"sequence errors propagate");
};
exports["test dropWhile"] = assert => {
let isNegative = x => x < 0;
let True = _ => true;
let False = _ => false;
let test = xs => {
assert.deepEqual([...dropWhile(isNegative, xs)],
[0, 1, 2],
"dropped negative");
assert.deepEqual([...dropWhile(True, xs)],
[],
"drop all");
assert.deepEqual([...dropWhile(False, xs)],
[-2, -1, 0, 1, 2],
"keep all");
};
test([-2, -1, 0, 1, 2]);
test(seq(function*() {
yield -2;
yield -1;
yield 0;
yield 1;
yield 2;
}));
assert.throws(() => [...dropWhile(boom, [1, 2, 3])],
/Boom/,
"function errors errors propagate");
assert.throws(() => [...dropWhile(x => true, broken)],
/Boom/,
"sequence errors propagate");
};
exports["test concat"] = assert => {
let test = (a, b, c, d) => {
assert.deepEqual([...concat()],
[],
"nothing to concat");
assert.deepEqual([...concat(a)],
[1, 2, 3],
"concat with nothing returns same as first");
assert.deepEqual([...concat(a, b)],
[1, 2, 3, 4, 5],
"concat items from both");
assert.deepEqual([...concat(a, b, a)],
[1, 2, 3, 4, 5, 1, 2, 3],
"concat itself");
assert.deepEqual([...concat(c)],
[],
"concat of empty is empty");
assert.deepEqual([...concat(a, c)],
[1, 2, 3],
"concat with empty");
assert.deepEqual([...concat(c, c, c)],
[],
"concat of empties is empty");
assert.deepEqual([...concat(c, b)],
[4, 5],
"empty can be in front");
assert.deepEqual([...concat(d)],
[7],
"concat singular");
assert.deepEqual([...concat(d, d)],
[7, 7],
"concat singulars");
assert.deepEqual([...concat(a, a, b, c, d, c, d, d)],
[1, 2, 3, 1, 2, 3, 4, 5, 7, 7, 7],
"many concats");
let ab = concat(a, b);
let abcd = concat(ab, concat(c, d));
let cdabcd = concat(c, d, abcd);
assert.deepEqual([...cdabcd],
[7, 1, 2, 3, 4, 5, 7],
"nested concats");
};
test([1, 2, 3],
[4, 5],
[],
[7]);
test(seq(function*() { yield 1; yield 2; yield 3; }),
seq(function*() { yield 4; yield 5; }),
seq(function*() { }),
seq(function*() { yield 7; }));
assert.throws(() => [...concat(broken, [1, 2, 3])],
/Boom/,
"function errors errors propagate");
};
exports["test first"] = assert => {
let test = (xs, empty) => {
assert.equal(first(xs), 1, "returns first");
assert.equal(first(empty), null, "returns null empty");
};
test("1234", "");
test([1, 2, 3], []);
test([1, 2, 3], null);
test([1, 2, 3], undefined);
test(seq(function*() { yield 1; yield 2; yield 3; }),
seq(function*() { }));
assert.equal(first(broken), 1, "did not reached error");
};
exports["test rest"] = assert => {
let test = (xs, x, nil) => {
assert.deepEqual([...rest(xs)], ["b", "c"],
"rest items");
assert.deepEqual([...rest(x)], [],
"empty when singular");
assert.deepEqual([...rest(nil)], [],
"empty when empty");
};
test("abc", "a", "");
test(["a", "b", "c"], ["d"], []);
test(seq(function*() { yield "a"; yield "b"; yield "c"; }),
seq(function*() { yield "d"; }),
seq(function*() {}));
test(["a", "b", "c"], ["d"], null);
test(["a", "b", "c"], ["d"], undefined);
assert.throws(() => [...rest(broken)],
/Boom/,
"sequence errors propagate");
};
exports["test nth"] = assert => {
let notFound = {};
let test = xs => {
assert.equal(nth(xs, 0), "h", "first");
assert.equal(nth(xs, 1), "e", "second");
assert.equal(nth(xs, 5), void(0), "out of bound");
assert.equal(nth(xs, 5, notFound), notFound, "out of bound");
assert.equal(nth(xs, -1), void(0), "out of bound");
assert.equal(nth(xs, -1, notFound), notFound, "out of bound");
assert.equal(nth(xs, 4), "o", "5th");
};
let testEmpty = xs => {
assert.equal(nth(xs, 0), void(0), "no first in empty");
assert.equal(nth(xs, 5), void(0), "no 5th in empty");
assert.equal(nth(xs, 0, notFound), notFound, "notFound on out of bound");
};
test("hello");
test(["h", "e", "l", "l", "o"]);
test(seq(function*() {
yield "h";
yield "e";
yield "l";
yield "l";
yield "o";
}));
testEmpty(null);
testEmpty(undefined);
testEmpty([]);
testEmpty("");
testEmpty(seq(function*() {}));
assert.throws(() => nth(broken, 1),
/Boom/,
"sequence errors propagate");
assert.equal(nth(broken, 0), 1, "have not reached error");
};
exports["test last"] = assert => {
assert.equal(last(null), null, "no last in null");
assert.equal(last(void(0)), null, "no last in undefined");
assert.equal(last([]), null, "no last in []");
assert.equal(last(""), null, "no last in ''");
assert.equal(last(seq(function*() { })), null, "no last in empty");
assert.equal(last("hello"), "o", "last from string");
assert.equal(last([1, 2, 3]), 3, "last from array");
assert.equal(last([1]), 1, "last from singular");
assert.equal(last(seq(function*() {
yield 1;
yield 2;
yield 3;
})), 3, "last from sequence");
assert.throws(() => last(broken),
/Boom/,
"sequence errors propagate");
};
exports["test dropLast"] = assert => {
let test = xs => {
assert.deepEqual([...dropLast(xs)],
[1, 2, 3, 4],
"dropped last");
assert.deepEqual([...dropLast(0, xs)],
[1, 2, 3, 4, 5],
"dropped none on 0");
assert.deepEqual([...dropLast(-3, xs)],
[1, 2, 3, 4, 5],
"drop none on negative");
assert.deepEqual([...dropLast(3, xs)],
[1, 2],
"dropped given number");
assert.deepEqual([...dropLast(5, xs)],
[],
"dropped all");
};
let testEmpty = xs => {
assert.deepEqual([...dropLast(xs)],
[],
"nothing to drop");
assert.deepEqual([...dropLast(0, xs)],
[],
"dropped none on 0");
assert.deepEqual([...dropLast(-3, xs)],
[],
"drop none on negative");
assert.deepEqual([...dropLast(3, xs)],
[],
"nothing to drop");
};
test([1, 2, 3, 4, 5]);
test(seq(function*() {
yield 1;
yield 2;
yield 3;
yield 4;
yield 5;
}));
testEmpty([]);
testEmpty("");
testEmpty(seq(function*() {}));
assert.throws(() => [...dropLast(broken)],
/Boom/,
"sequence errors propagate");
};
exports["test distinct"] = assert => {
let test = (xs, message) => {
assert.deepEqual([...distinct(xs)],
[1, 2, 3, 4, 5],
message);
};
test([1, 2, 1, 3, 1, 4, 1, 5], "works with arrays");
test(seq(function*() {
yield 1;
yield 2;
yield 1;
yield 3;
yield 1;
yield 4;
yield 1;
yield 5;
}), "works with sequences");
test(new Set([1, 2, 1, 3, 1, 4, 1, 5]),
"works with sets");
test(seq(function*() {
yield 1;
yield 2;
yield 2;
yield 2;
yield 1;
yield 3;
yield 1;
yield 4;
yield 4;
yield 4;
yield 1;
yield 5;
}), "works with multiple repeatitions");
test([1, 2, 3, 4, 5], "work with distinct arrays");
test(seq(function*() {
yield 1;
yield 2;
yield 3;
yield 4;
yield 5;
}), "works with distinct seqs");
};
exports["test remove"] = assert => {
let isPositive = x => x > 0;
let test = xs => {
assert.deepEqual([...remove(isPositive, xs)],
[-2, -1, 0],
"removed positives");
};
test([1, -2, 2, -1, 3, 7, 0]);
test(seq(function*() {
yield 1;
yield -2;
yield 2;
yield -1;
yield 3;
yield 7;
yield 0;
}));
assert.throws(() => [...distinct(broken)],
/Boom/,
"sequence errors propagate");
};
exports["test mapcat"] = assert => {
let upto = n => seq(function* () {
let index = 0;
while (index < n) {
yield index;
index = index + 1;
}
});
assert.deepEqual([...mapcat(upto, [1, 2, 3, 4])],
[0, 0, 1, 0, 1, 2, 0, 1, 2, 3],
"expands given sequence");
assert.deepEqual([...mapcat(upto, [0, 1, 2, 0])],
[0, 0, 1],
"expands given sequence");
assert.deepEqual([...mapcat(upto, [0, 0, 0])],
[],
"expands given sequence");
assert.deepEqual([...mapcat(upto, [])],
[],
"nothing to expand");
assert.deepEqual([...mapcat(upto, null)],
[],
"nothing to expand");
assert.deepEqual([...mapcat(upto, void(0))],
[],
"nothing to expand");
let xs = seq(function*() {
yield 0;
yield 1;
yield 0;
yield 2;
yield 0;
});
assert.deepEqual([...mapcat(upto, xs)],
[0, 0, 1],
"expands given sequence");
assert.throws(() => [...mapcat(boom, xs)],
/Boom/,
"function errors errors propagate");
assert.throws(() => [...mapcat(upto, broken)],
/Boom/,
"sequence errors propagate");
};
require("sdk/test").run(exports);
