landau/reductions

Returns an array of intermediate values of the reduction (as per reduce) of coll by fn, starting with init.

reductions

Returns an array of intermediate values of the reduction (as per reduce) of coll by fn, starting with init.

function reductions(coll, fn, init) { ... }

Install

npm i -S reductions

Usage

var assert = require('assert');
var reductions = require('./');

var coll = [1, 2, 3, 4, 5];
var expect = [1, 3, 6, 10, 15];

function add(a, b) {
  return a + b;
}

// Without an initial value
var arr = reductions(coll, add);
assert.deepEqual(arr, expect);

// WITH an initial value
var arr = reductions(coll, add, 2);
assert.deepEqual(arr, [2, 3, 5, 8, 12, 17]);