Nodejs String Starts With startsWith(prefix)

Method Source Code

// additional functionality for Strings
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)
{
   if(suffix == null)
      return false;
   if(this.length < suffix.length)
      return false;
   return this.substring(this.length - suffix.length, this.length) == suffix;
};

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

Related

1. startsWith(prefix)

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

2. startsWith(prefix)

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

3. startsWith(prefix)

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

4. startsWith(prefix)

   'use strict';
   var mime = require('mime');
   String.prototype.startsWith = function(prefix) {
     return this.indexOf(prefix) === 0;
   };
   String.prototype.endsWith = function(suffix) {
     return this.indexOf(suffix, this.length - suffix.length) !== -1;
   };
   

5. startsWith(prefix)

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

6. startsWith(prefix)

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

7. 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() {
   ...
   

8. startsWith(s)

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

9. startsWith(s)

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