Nodejs Utililty Methods String Contains

String.prototype.contains = function(str)
  return this.indexOf(str) != -1;
};

String.prototype.contains = function(str){
  var filters = str.toLowerCase().split(/[ ,_\-]+/);
  var tokens = this.toLowerCase().split(/[ ,\-]+/);
  for (var i = 0; i < filters.length; i++) {
    var match = false;
    for (var j = 0; j < tokens.length; j++) {
      if (tokens[j].startsWith(filters[i])) {
        match = true;
        break;
...

String.prototype.contains = function (str) {
    return this.indexOf(str) > -1;
};
String.prototype.startsWith = function (str) {
    return this.indexOf(str) == 0;
};
String.prototype.endsWith = function (str) {
    return this.indexOf(str) > -1 && (this.indexOf(str) + str.length) == this.length;
};
...

String.prototype.contains = function(str) {
  return this.indexOf(str) > -1;
};
String.prototype.endsWith = function(suffix) {
  return this.indexOf(suffix, this.length - suffix.length) !== -1;
};

String.prototype.contains = function(str, ignoreCase) {
    return (ignoreCase ? this.toUpperCase() : this)
            .indexOf(ignoreCase ? str.toUpperCase() : str) >= 0;
};
String.prototype.startsWith = function(str) {
    return this.indexOf(str) == 0;
};

String.prototype.contains = function(str, index) {
  return (this.indexOf(str, index) !== -1) ? true : false;

String.prototype.contains = function(str,startIndex) {
    return -1 !== String.prototype.indexOf.call(this,str,startIndex);
};

String.prototype.contains = function(strPattern){
  if(typeof strPattern !== 'string') return false;
  var pattern = new RegExp(strPattern, "i");
  return pattern.test(this);
console.log("teste".contains("teste"));

String.prototype.contains = function(string) {
  return (this.indexOf(string) != -1);

String.prototype.contains = function(string) {
    return this.indexOf(string) > -1;
};