How to Select a Random Value from a JavaScript Array?

Selecting Random Values from JavaScript Arrays

Consider an array of strings:

var myArray = ['January', 'February', 'March'];

How do you retrieve a random value from this array using JavaScript?

Solution

The answer lies in a simple one-liner:

const randomElement = array[Math.floor(Math.random() * array.length)];

The Math.random() function generates a random decimal value between 0 and 1 (exclusive). Multiplying this by the array's length and using Math.floor() ensures an integer index within the array's bounds.

For example:

const months = ["January", "February", "March", "April", "May", "June", "July"];

const random = Math.floor(Math.random() * months.length);
console.log(random, months[random]); // Output: 3 April

This snippet generates a random index between 0 and 6, and outputs the corresponding value from the months array.

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