Revision fc0627cda4f3fafad3b8b212ce7912c53771e78e authored by Irakli Gozalishvili on 22 January 2013, 17:02:00 UTC, committed by Irakli Gozalishvili on 22 January 2013, 17:02:00 UTC
1 parent bac1edf
concat.js
"use strict";
var reducible = require("reducible/reducible")
var reduce = require("reducible/reduce")
var end = require("reducible/end")
var slicer = Array.prototype.slice
function append(left, right) {
/**
Returns sequences of items in the `left` sequence followed by the
items in the `right` sequence.
**/
return reducible(function reduceConcatination(next, initial) {
reduce(left, function reduceLeft(value, result) {
return value === end ? reduce(right, next, result) :
next(value, result)
}, initial)
})
}
function concat(left, right /*, ...rest*/) {
/**
Returns a sequence representing the concatenation of the elements in the
supplied arguments, in the given order.
print(concat([ 1 ], [ 2, 3 ], [ 4, 5, 6 ])) // => <stream 1 2 3 4 5 6 />
**/
switch (arguments.length) {
case 1: return left
case 2: return append(left, right)
default: return slicer.call(arguments).reduce(append)
}
}
module.exports = concat
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