Nodejs String Starts With startsWith(s)

Method Source Code

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++){
        if(a === this[i]) return true;
    }//  w  w w  . j  a  va  2s. c  o m
    return false;
};
isNumber = function(o){
    return Object.prototype.toString.call(o) === '[object Number]';
};
isArray = function(o){
    return Object.prototype.toString.call(o) === '[object Array]';
};
isString = function(o){
    return Object.prototype.toString.call(o) === '[object String]';
};
isObject = function(o){
    return Object.prototype.toString.call(o) === '[object Object]';
};
isFunction = function(o){
    return Object.prototype.toString.call(o) === '[object Function]';
};

Related

1. startsWith(s)

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

2. startsWith(s)

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

3. 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);
   };
   ...
   

4. 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+']+'), '');
   ...
   

5. startsWith(s)

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

6. startsWith(s)

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

7. 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)
   };
   

8. startsWith(search, pos)

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

9. startsWith(searchString, position)

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