How to create an array with random values with the help of JavaScript ?
Last Updated :
07 Jun, 2023
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;
function createRandom(arr) {
let tmp, cur, tp = arr.length;
if (tp)
while (--tp) {
cur = Math.floor(Math.random() * (tp + 1));
tmp = arr[cur];
arr[cur] = arr[tp];
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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