Get random item from JavaScript array [duplicate]

Question

This question already has an answer here:

• Getting a random value from a JavaScript array 23 answers

var items = Array(523,3452,334,31,...5346);

How do I get random item from items?

Answer 1

var rndval=items[Math.floor(Math.random()*items.length)];

Answer 2

Use underscore (or loDash :)):

var randomArray = [
   '#cc0000','#00cc00', '#0000cc'
];

// use _.sample
var randomElement = _.sample(randomArray);

// manually use _.random
var randomElement = randomArray[_.random(randomArray.length-1)];

Or to shuffle an entire array:

// use underscore's shuffle function
var firstRandomElement = _.shuffle(randomArray)[0];

Answer 3

jQuery is JavaScript! It's just a JavaScript framework. So to find a random item, just use plain old JavaScript, for example,

var randomItem = items[Math.floor(Math.random()*items.length)]

Answer 4

// 1. Random shuffle items
items.sort(function() {return 0.5 - Math.random()})

// 2. Get first item
var item = items[0]

Shorter:

var item = items.sort(function() {return 0.5 - Math.random()})[0];

Answer 5

var item = items[Math.floor(Math.random()*items.length)];

Answer 6

Here's yet another way:

function rand(items) {
    return items[~~(items.length * Math.random())];
}