to avoid contatenação strings (the idea is just to avoid the possibility of errors). follows an extension of the String Object

interpolate String in JS

String.prototype.supplant = function (o) {
    return this.replace(/{([^{}]*)}/g,
        function (a, b) {
            var r = o[b];
            return typeof r === 'string' || typeof r === 'number' ? r : a;
        }
    );
};
 
// Ho to use:
var nome = 'lalala';
var index += 1;
"{name}[{index}]".supplant({ name: nome, index: index})
 
//Enjoy