JSFiddle - React, Tailwind, and code Playground

by MrTest

JavaScript

var ColumnsNumber = 5;

String.prototype.repeat = function( num )
                {
                     return new Array( num + 1 ).join( this );
                }
                var Cokolwiek = "(,null)".repeat(ColumnsNumber)
                var aoColumns = "[sType\": \"natural" +  Cokolwiek + "}]";

console.log(aoColumns)