I want to generate an array with a random number that each number is different. Could someone help me to solve this? Thanks.
var array = [];
for(var i = 0;i < 5; i++){
var a = Math.floor(Math.random() * 5);
array.push(a);
}
console.log(array);
var array = [];
for (var i = 0; i < 10; i++) {
var a = Math.floor(Math.random() * 10);
while (array.indexOf(a) !== -1) {
a = Math.floor(Math.random() * 10);
}
array.push(a);
}
console.log(array);Math.random() returns a number a floating point number between 0 & 1. So multiplying with a 5 and then doing Math.floor can result a number between 0 & 4. Hence you array may contain duplicate number
var array = [];
for (var i = 0; i < 5; i++) {
var a = parseInt(Math.random() * i * 100, 10);
array.push(a);
}
console.log(array);with this implementation you will be sure you are not going to add more than one time an existing number inside var array.
var array = [];
function randomNumber(array) {
var a = Math.floor(Math.random() * 5);
var found = array.filter(el => el == a);
if(found.length) return randomNumber(array);
return a;
}
for(var i = 0; i < 5; i++){
array.push(randomNumber(array));
}
console.log(array);
[0,1,2,3,4]- then shuffle that array using your algorithm of choice (Fisher-Yates Shuffle recommended). This will ensure the results are unique.set = new Set(); while (set.size < 5) set.add(Math.floor(Math.random() * 5));