how to convert array into comma separated numbers in javascript code example

Example: convert number to comma separated format javascript

// Convert a number to a string with commas
function numberWithCommas(x) {
    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}

// Convert a number to a string with commas taking into account decimal point
function numberWithCommasDecimal(x) {
    return x.toString().replace(/\B(?<!\.\d*)(?=(\d{3})+(?!\d))/g, ",");
}