array-comprehensions

Array comprehensions if you don't want to use 6to5 or traceur.

Installation

npm install array-comprehensions

Usage

var forOf = require('array-comprehensions');

function inc(x) {
  return x+1;
}

function mul(x, y) {
  return x*y;
}

function sqr(x) {
  return x*x;
}

function isGreatherThan1(x) {
  return x>1
}

// [for (x of [1,2,3]) inc(x)]
forOf([1, 2, 3], inc); // => [2, 3, 4]

// [for (x of [1,2,3]) for (y of [3,2,1]) mul(x,y)]
forOf([1, 2, 3], [3, 2, 1], mul); // => [3, 2, 1, 6, 4, 2, 9, 6, 3]

// [for (x of [1,2,3]) if (isGreatherThan1(x)) sqr(x)]
forOf([1, 2, 3], isGreatherThan1, sqr); // => [4, 9]

API

forOf

forOf(iterable, do)

Execute the function do for each item of iterable.

forOf([1, 2, 3], function(x){
  return x+1;
}); // => [2, 3, 4]

forOf(iterable, condition, do)

Execute the function do for each item of iterable that fullfills the condition.

forOf([1, 2, 3, 4], function(x) {
  return x % 2 === 0;
}, function(x) {
  return x*x;
}); // => [4,16]

forOf(iterable1, iterable2, do)

Execute the function do for each item of iterable1 with every item of iterable2.

forOf([1, 2], [1,2], function(x, y) {
  return x*y;
}); // => [1,2,2,4]