Picking a random array element from an array [duplicate]

Question

Possible Duplicate:
How can I return a random value from an array?
Getting random value from an array

If you have an array of:

days = ["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"]

How would I randomly pick an element from this array?

Though the title of the linked duplicate is jQuery, it's actually pure JavaScript so fit here as well. — user447356
– user447356, Commented Dec 8, 2011 at 12:39
@Tomalak nice, the duplicate link still show the old title though.. hope it's just cache. — user447356
– user447356, Commented Dec 8, 2011 at 12:44
@ShadowWizard: I don't think the title gets updated in the comments, you'd have to edit it. — Felix Kling
– Felix Kling, Commented Dec 8, 2011 at 12:59
@Felix Hopefully it will get closed then the comment will be automatically removed.. — user447356
– user447356, Commented Dec 8, 2011 at 13:16

evilone · Accepted Answer · 2011-12-08 12:38:19Z

2

var randomDay = days[Math.floor(Math.random()*days.length)]
document.write(randomDay);

answered Dec 8, 2011 at 12:38

evilone

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Thomas Johan Eggum · Accepted Answer · 2011-12-08 12:38:48Z

1

You could use

days[Math.floor(Math.random()*days.length)];

answered Dec 8, 2011 at 12:38

Thomas Johan Eggum

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jabclab · Accepted Answer · 2011-12-08 12:46:21Z

0

If you wanted you could make this a generic function of all Arrays, i.e.

Array.prototype.getRandomElement = function () {
    return this[Math.floor(Math.random() * this.length)];
};

var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday",
    randomDay = days.getRandomElement();

answered Dec 8, 2011 at 12:46

jabclab

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