# How to get Random value from an array in javascript This example covers how to get a random number from an array of numbers in javascript.

Let’s declare an array

``var array = [1, 2, 3, 4];``

Here elements index starts from zero, and the end index is an array.length-1, i.e 1

## Javascript random number from array example

There are multiple ways we can do

• use Math.random() function

`Math.random()` generates the random number between 0 and 1 and it is multiplied by the array length and the number always returns between 0 and to array length, This is called the random Index. `Math.floor()`returns an integer for a lower value of a floating

``````var array = [1, 2, 3, 4];
let randomIndex = Math.floor(Math.random() * array.length);
var randomNumber = array[randomIndex];
console.log(randomNumber); // returns 1 or 2 or 3 or 4``````
• use Lodash or underscore sample function

`sample()` function in lodash/underscore returns the random number for a given list of items.

syntax:

``_.sample(list, [Optional Count])``

`List` is an Array or set `Optional Count`- Number of Random numbers returned, Optional, Default is 1

Here is an example

``````var array = [1, 2, 3, 4];
console.log(_.sample(array)); // returns 1 or 2 or 3 or 4
console.log(_.sample(array, 3)); // returns array of three random numbers``````

Another function, `sampleSize()` in lodash also does the same thing.

``````var array = [1, 2, 3, 4];
console.log(_.sampleSize(array)); // returns 1 or 2 or 3 or 4
console.log(_.sampleSize(array, 3)); // returns array of three random numbers``````

## Conclusion

To conclude, Learn how to get Random numbers from an array of numbers in javascript.