Question

How to generate an array with unique random numbers in a specified range using Javascript

Answer 1

function generateUniqueRandomNumbersArray(total_numbers, max_range) {
    const arr = []
    
    while (arr.length < total_numbers) {
        let number = Math.floor(Math.random() * max_range) + 1
        if (arr.indexOf(number) === -1) {
            arr.push(number)
        }
    }
    
    return(arr)
}


const arr = generateUniqueRandomNumbersArray(15, 21);

console.log(arr);



/*
run:

[
   3, 5, 21, 19,  6,  1,
  16, 8, 14, 10, 13, 11,
  20, 2, 15
]

*/

 

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