Nodejs String Starts With startsWith(prefix)

Method Source Code

/**/*from  w  w w .j av a  2s.com*/
 * see if a string begins with a given string
 * 
 * Once ecmascript adds this natively, you should build core.js without this method:
 * @link http://wiki.ecmascript.org/doku.php?id=harmony%3astring_extras
 * @function external:String.prototype.startsWith
 * @param {string} A substring expected to be in the beginning of this string
 * @return {boolean}
  * @example
  *  'some string'.startsWith('s') === true;
 */
String.prototype.startsWith = function (prefix){
    return this.slice(0, prefix.length) === prefix;
};

Related

1. startsWith(prefix)

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

2. startsWith(prefix)

   String.prototype.startsWith = function(prefix) {
     var i = this.indexOf(prefix);
     if (i == 0) {
       return true;
     return false;
   

3. startsWith(prefix)

   String.prototype.startsWith = function (prefix) {
     "use strict";
     if (!prefix && typeof prefix !== 'string') {
       return false;
     return this.indexOf(prefix) === 0;
   };
   

4. startsWith(prefix)

   String.prototype.startsWith = function(prefix){
       return !this.indexOf(prefix);
   };
   (function(){
       window.onload = function(){
           return;
           var as = document.getElementsByTagName("a");
           for(var i=0,l=as.length; i<l; i++){
               var a=as[i], href=a.getAttribute("href") || a.href;
   ...
   

5. startsWith(prefix)

   String.prototype.startsWith = function (prefix) {
       return this.toLowerCase().indexOf(prefix.toLowerCase()) == 0;
   };
   

6. startsWith(prefix)

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

7. startsWith(prefix)

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

8. startsWith(prefix)

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

9. startsWith(prefix)

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