Nodejs String Starts With startsWith(search, pos)

Method Source Code

String.prototype.startsWith = String.prototype.startsWith || function(search, pos) {
    'use strict';
    return this.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search;
};

Related

1. 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+']+'), '');
   ...
   

2. startsWith(s)

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

3. startsWith(s)

   String.prototype.startsWith = function(s){
       return /^s/i.test(this);
   };
   String.prototype.endsWith = function(s){
       return /s$/i.test(this);
   };
   Array.prototype.contains = function(a){
       var l = this.length;
       for(var i=0;i<l;i++){
   ...
   

4. startsWith(s)

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

5. startsWith(s, i)

   String.prototype.startsWith = function(s, i) {
     if(i) { return s.toLowerCase() == this.substring(0, s.length).toLowerCase() }
     return s == this.substring(0, s.length)
   };
   

6. startsWith(searchString, position)

   String.prototype.startsWith = function(searchString, position) {
     position = position || 0;
     return this.indexOf(searchString, position) === position;
   

7. startsWith(searchString, position)

   if (!String.prototype.startsWith) {
     String.prototype.startsWith = function(searchString, position) {
       position = position || 0;
       return this.indexOf(searchString, position) === position;
     };
   

8. startsWith(searchString, position)

   String.prototype.startsWith = function(searchString, position){
         position = position || 0;
         return this.substr(position, searchString.length) === searchString;
   };
   

9. startsWith(searchString, position)

   String.prototype.startsWith = function(searchString, position) {
     position = position || 0
     return this.substr(position, searchString.length) === searchString