Nodejs Utililty Methods String Starts With

String.prototype.startWith = function(str){
  return this.indexOf(str) == 0;
};

String.prototype.startWith = function(str) {
  var reg = new RegExp("^" + str);
  return reg.test(this);
};

String.prototype.startWith = function (str) {
  var reg = new RegExp("^" + str);
  return reg.test(this);

String.prototype.startWith=function(str){
if(str==null||str==""||this.length==0||str.length>this.length)
  return false;
if(this.substr(0,str.length)==str)
  return true;
else
  return false;
return true;

String.prototype.startWith = function(str) {
  var result = true;
  if (typeof(str)=='string' && str.length <= this.length) {
    for (var i=0,len=str.length;i<len;i++) {
      if (str.charAt(i) == this.charAt(i)) {
        continue;
      } else {
        result = false;
        break;
...

String.prototype.startWith = function(str) {
  var reg = new RegExp("^" + str);
  return reg.test(this);
};
String.prototype.endWith = function(str) {
  var reg = new RegExp(str + "$");
  return reg.test(this);
};

String.prototype.startWith=function(str){     
  var reg=new RegExp("^"+str);     
  return reg.test(this);        
String.prototype.endWith=function(str){     
  var reg=new RegExp(str+"$");     
  return reg.test(this);        

String.prototype.startWith=function(str){  
    if(str==null||str==""||this.length==0||str.length>this.length)  
      return false;  
    if(this.substr(0,str.length)==str)  
      return true;  
    else  
      return false;  
    return true;  
};
...

String.prototype.startWith = function(substr) {
    return this.indexOf(substr) == 0;
};

String.prototype.startWith = function (text) {
    return this.indexOf(text) == 0;
};
var msg = "Hello world!";
console.log(msg.startWith("Hello"));