Nodejs String Starts With startsWith(s)

Method Source Code

/**/*from   w  ww.j  a va 2s  . com*/
 * Adds a method to the String object that checks to see if it starts with a given value
 * @param s the value to test
 * @return true or false
 */
String.prototype.startsWith = function(s) {
    return (s === this.substr(0, s.length));
}

Related

1. startsWith(prefix)

   String.prototype.startsWith = function(prefix)
     if(prefix == null)
       return false;
     if(this.length < prefix.length)
       return false;
     return this.substring(0, prefix.length) == prefix;
   };
   String.prototype.endsWith = function(suffix)
   ...
   

2. startsWith(prefix)

   String.prototype.startsWith = function (prefix) {
     return this.substring(0, prefix.length) == prefix;
   };
   

3. startsWith(prefix, ignoreCase)

   String.prototype.startsWith = function (prefix, ignoreCase) {
       var _prefix = prefix.source ? prefix.source : prefix.escapeRegExp();
       return this.match(new RegExp("^" + _prefix, ignoreCase ? 'i' : ''));
   };
   String.prototype.endsWith = function (suffix, ignoreCase) {
       var _suffix = suffix.source ? suffix.source : suffix.escapeRegExp();
       return this.match(new RegExp(_suffix + "$", ignoreCase ? 'i' : ''));
   };
   String.prototype.escapeRegExp = function() {
   ...
   

4. startsWith(s)

   String.prototype.startsWith = function (s) {
       if (this.substr(0, s.length) === s)
           return true;
       else
           return false;
   

5. startsWith(s)

   String.prototype.startsWith = function (s) {
     return (this.indexOf(s) === 0);
   

6. startsWith(s)

   String.prototype.startsWith = function(s){
      return (this.indexOf(s)===0);
   

7. startsWith(s)

   function nullOrEmpty(obj) {
       if (obj == null || obj.length == 0 || obj == 'undefined') {
           return true;
       return false;
   String.prototype.startsWith = function (s) {
       return (this.indexOf(s) == 0);
   };
   ...
   

8. startsWith(s)

   String.prototype.startsWith=function(s)
     return this.substring(0,s.length)==s;
   };
   var defaultTrimChars=' \t\r\n';
   String.prototype.trimStart=function(chars)
     chars=chars ||defaultTrimChars;
     return this.replace(new RegExp('^['+chars+']+'), '');
   ...
   

9. startsWith(s)

   String.prototype.startsWith = function(s)
     if(s==null || this.length < s.length) return false;
     return this.substr(0,s.length) == s;
     };