How to select a random element from array in JavaScript ?
Last Updated :
30 Nov, 2023
In this article, we are going to learn how can we select a random element from an array in JavaScript. we will be given an array and we need to print a random element from that array.
How to select a random element from an array in JavaScript?
These are the following approaches for solving this problem:
- Use the “Math.random()” function to get the random number between(0-1, 1 exclusive).
- Multiply it by the array length to get the numbers between(0-arrayLength).
- Use the “Math.floor()” to get the index ranging from(0 to arrayLength-1).
Example: This example implements the above approach. Â
Javascript
let arr = ["GFG_1", "GeeksForGeeks",
"Geeks", "Computer Science Portal"];
function GFG_Fun() {
console.log(arr[(Math.floor(Math.random() * arr.length))]);
}
GFG_Fun()
|
Output
Computer Science Portal
Using custom function
- The random(a, b) method is used to generate a number between(a to b, b exclusive).
- Taking the floor value to range the numbers from (1 to array length).
- Subtract 1 to get the index ranging from(0 to arrayLength-1).
Example: This example implements the above approach.Â
Javascript
let arr = ["GFG_1", "GeeksForGeeks",
"Geeks", "Computer Science Portal"];
function random(mn, mx) {
return Math.random() * (mx - mn) + mn;
}
function GFG_Fun() {
console.log(arr[(Math.floor(random(1, 5))) - 1]);
}
GFG_Fun()
|
- In this approach we are using the third party librray.
- The _.sample() method takes an array as an input an returns the random element from that given array.
- we willuse _.sample() method to print random element from an array.
Example: This example implements the above approach.Â
Javascript
const _ = require("lodash");
let array1 = ([3, 6, 9, 12]);
let gfg = _.sample(array1);
console.log("original array1: ", array1)
console.log(gfg);
|
Output:
original array1: [ 3, 6, 9, 12 ]
12
JavaScript is best known for web page development but it is also used in a variety of non-browser environments. You can learn JavaScript from the ground up by following this JavaScript Tutorial and JavaScript Examples.
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