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JavaScript - How to pick random elements from an array?
Suppose, we have an array of literals that contains no duplicate elements like this −
const arr = [2, 5, 4, 45, 32, 46, 78, 87, 98, 56, 23, 12];
We are required to write a JavaScript function that takes in an array of unique literals and a number n.
The function should return an array of n elements all chosen randomly from the input array and no element should appear more than once in the output array.
Example
Following is the code −
const arr = [2, 5, 4, 45, 32, 46, 78, 87, 98, 56, 23, 12];
const chooseRandom = (arr, num = 1) => {
const res = [];
for(let i = 0; i < num; ){
const random = Math.floor(Math.random() * arr.length);
if(res.indexOf(arr[random]) !== -1){
continue;
};
res.push(arr[random]);
i++;
};
return res;
};
console.log(chooseRandom(arr, 4));Output
This will produce the following output in console −
[ 5, 2, 4, 78 ]
Updated on: 30-Sep-2020
1K+ Views
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