Question

How to insert items into an array at a random indexes in JavaScript

Answer 1

let arr = [], 
    elements = 10; 

for (let i = 0; i < elements; i += 1) {
    arr.push("X");
}

for (let i = 0; i < elements; i++) {
    let index = Math.round(Math.random() * (arr.length));
    arr.splice(index, 1, i.toString());
}
 
console.log(arr);
 
 
     
     
/*
run:
     
["X", "0", "4", "5", "X", "7", "X", "3", "6", "9", "8"]
     
*/

 

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