How to format numbers similar to Stack Overflow reputation format

Question

I want to convert a number into a string representation with a format similar to Stack Overflow reputation display.

e.g.

• 999 == \'999\'
• 1000 =

Answer 1

I created an npm (and bower) module to do this:

npm install --save approximate-number

Usage:

var approx = require('approximate-number');
approx(123456); // "123k"