https://github.com/Gozala/reducers
Tip revision: 2a5706e16ddbd76deabdd176b570f97984b6f153 authored by Irakli Gozalishvili on 10 November 2012, 06:03:09 UTC
Version 1.0.2
Version 1.0.2
Tip revision: 2a5706e
reductions.js
"use strict";
var reducible = require("./reducible")
var accumulate = require("./accumulate")
var end = require("./end")
var isError = require("./is-error")
function reductions(source, f, initial) {
/**
Returns `reducible` collection of the intermediate values of the reduction
(as per reduce) of `source` by `f`, starting with `initial` value.
## Example
var numbers = reductions([1, 1, 1, 1], function(accumulated, value) {
return accumulated + value
}, 0)
print(numbers) // => < 1 2 3 4 >
**/
return reducible(function reduceReducible(next, start) {
var state = initial
return accumulate(source, function reduceSource(value, result) {
if (value === end) return next(end, result)
if (isError(value)) return next(value, result)
state = f(state, value)
return next(state, result)
}, start)
})
}
module.exports = reductions