amount separated by comma in javascript code example

Example 1: 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, ",");
}

Example 2: javascript array to comma separated string

var colors = ["red", "blue", "green"];
var colorsCSV = colors.join(","); //"red,blue,green"