g.js

g.js is a very small library (0.4kb minified, 0.2kb minified and gzipped) which provide a simple method to iterate over a suit of numbers. It can be used with Node.js or in the browser.

Installing

Node:

Install it with npm install gjs.

var g = require('gjs');

Browser:

<script src="…/g.min.js"></script>

Usage

g.from(<from>).to(<to>) [.excluded()] [.by(<step>)] { ._do(<fn>) | .to_a() }

• <from>: first number

• <to>: last number (included)

• <step>: increment for each step (may be negative; default: 1)

• <fn>: function executed with every number

• .excluded(): exclude the last number

• .by(…): use a custom step

• .to_a(): return an array of numbers

• ._do(…): iterate over the numbers suit with a function. It can be chained.

Examples

Basic:

> g.from(1).to(5)._do(function(e) {
 console.log(e);
});
1
2
3
4
5

Excluding final step:

> g.from(1).to(5).excluded()._do(function(e) {
 console.log(e);
});
1
2
3
4

Negative step:

> g.from(3).to(0).by(-1)._do(function(e) {
    console.log(e);
});
3
2
1
0

chained ._do(…):

> var f = function(e) {console.log(e);}
> g.from(0).to(1)._do(f)._do(f)
0
1
0
1

Get an array:

> g.from(1).to(10).to_a()
[1,2,3,4,5,6,7,8,9,10]