How to create an array with random values with the help of JavaScript ?
The task is to generate an array with random values with the help of JavaScript. There are two approaches which are discussed below:
Approach 1:
- Use Math.random() and Math.floor() methods to get the random values.
- Push the values one by one in the array (But this approach may generate repeated values).
Example: This example implements the above approach.
Javascript
function gfg_Run() { console.log(Array.from({ length: 10 }, () => Math.floor(Math.random() * 10)));}gfg_Run() |
Output
[ 8, 6, 4, 3, 9, 2, 8, 9, 7, 8 ]
Approach 2:
- Create an array and put the values in it (like 1 at index 0, 2 at index 1, and 3 at index 2 in the same order by a loop.)
- Assign a variable (tp) = length of the array.
- Run a loop on variable(tp).
- Inside the loop use Math.random() and Math.floor() methods to get the random index of the array.
- Swap this array value with the index(tp) and decrease the variable(tp) by 1.
- Run the loop until variable(tp) becomes 0.
Example: This example implements the above approach.
Javascript
let a = []for ( i = 0; i < 10; ++i) a[i] = i;// Array like[1, 2, 3, 4, ...]function createRandom(arr) { let tmp, cur, tp = arr.length; if (tp) // Run until tp becomes 0. while (--tp) { // Generating the random index. cur = Math.floor(Math.random() * (tp + 1)); // Getting the index(cur) value in variable(tmp). tmp = arr[cur]; // Moving the index(tp) value to index(cur). arr[cur] = arr[tp]; // Moving back the tmp value to // index(tp), Swapping is done. arr[tp] = tmp; } return arr;}function gfg_Run() { console.log(createRandom(a));}gfg_Run() |
Output
[ 0, 9, 4, 3, 6, 8, 2, 7, 1, 5 ]
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