How to generate sequence of numbers/chars in javascript?

Question

Is there a way to generate sequence of characters or numbers in javascript?

For example, I want to create array that contains eight 1s. I can do it with for loop, bu

Answer 1

var GetAutoNumber = exports.GetAutoNumber = (L) => {
    let LeftPad = (number, targetLength) => {
        let output = number + '';
        while (output.length < targetLength) {
            output = '0' + output;
        }
        return output;
    }
    let MaxNumberOfGivenLength = "";
    for (let t = 0;t < L;t++) {
        MaxNumberOfGivenLength = MaxNumberOfGivenLength + "9"
    }
    let StartTime = +new Date();
    let Result = [];
    let ReturnNumber;
    for (let i = 1;i <= MaxNumberOfGivenLength;i++) {
        Result.push(LeftPad(i, L))
    }
    for (let k = 0;k != 26;k++) {
        for (let j = 0;j <= 999;j++) {
            Result.push(String.fromCharCode(k + 65) + LeftPad(j, (L - 1)));
        }
    }
    console.log(Result.length)
    return Result;
}
GetAutoNumber(3)

It will generate result like 001-999, A01-A99... Z01-Z99