weighted-random

Select randomly from a list of weighted values.

Usage

var weightedRandom = require('weighted-random');
 
var movies = [
    { rating: 9.2, title: 'The Dark Knight' },
    { rating: 8.7, title: 'Inception' },
    { rating: 8.0, title: 'Jurassic Park' }
];
 
var weights = movies.map(function (movie) {
    return movie.rating;
}); // [9.2, 8.7, 8.0]
 
var selectionIndex = weightedRandom(weights); // 0, 1, or 2
 
var whatToWatch = movies[selectionIndex].title;
// About 36% of the time, we'll watch The Dark Knight.
// About 34% of the time, we'll watch Inception.
// About 31% of the time, we'll watch Jurassic Park.

License

Copyright © 2015 Brandon Mills. All rights reserved. Licensed under the terms of the MIT license, the full text of which is available in LICENSE.