Nodejs Array Index indexOf(a)

Method Source Code

Array.prototype.indexOf=function(a){
   for(var b=0;b<this.length;b++)
   if(this[b]===a)
      return b;//from   w  w w. j  a va  2  s. co m
   return-1
};

Related

1. indexOf || (Array.prototype.indexOfindexOf(searchElement)

   "use strict";
   Array.prototype.indexOf || (Array.prototype.indexOf=function indexOf(searchElement) {
       var array = this,
           length = array.length,
           index = 0;
       for (index = 0; index < length; ++index) {
           if (array[index] === searchElement) {
               return index;
       return -1;
   });
   

2. indexOf( v, b, s )

   Array.prototype.indexOf = function( v, b, s ) {
     for( var i = +b || 0, l = this.length; i < l; i++ ) {
       if( this[i]===v || s && this[i]==v ) { return i; }
     return -1;
   };
   

3. indexOf( value )

   Array.prototype.indexOf = function( value )
     for ( var i = 0 ; i < this.length ; i++ )
       if ( this[i] == value )
         return i ;
     return -1 ;
   

4. indexOf( value )

   Array.prototype.indexOf = function( value )
     for( var i = 0; i < this.length; i++ )
       if( this[ i ] === value ) return i;
     return -1;
   };
   

5. indexOf()

   Object.create = Object.create ||
   function create(o) {
       "use strict";
       function F() {}
       F.prototype = o;
       return new F();
   };
   Object.getPrototypeOf = Object.getPrototypeOf ||
   function getPrototypeOf() {
   ...
   

6. indexOf(d, e)

   Array.prototype.indexOf || (Array.prototype.indexOf = function(d, e) {
       var a;
       if (null == this) throw new TypeError('"this" is null or not defined');
       var c = Object(this),
           b = c.length >>> 0;
       if (0 === b) return -1;
       a = +e || 0;
       Infinity === Math.abs(a) && (a = 0);
       if (a >= b) return -1;
   ...
   

7. indexOf(e)

   Array.prototype.indexOf = function (e) {
       for (var i = 0, j; j = this[i]; i++) {
           if (j == e) { return i; }
       return -1;
   

8. indexOf(el/*, from*/)

   Array.prototype.indexOf = Array.prototype.indexOf || function(el) {
     var len = this.length >>> 0;
     var from = Number(arguments[1]) || 0;
     from = (from < 0) ? Math.ceil(from) : Math.floor(from);
     if (from < 0) from += len;
     for (; from < len; from++) {
       if (from in this && (this[from] === el)) {
         return from;
     return -1;
   };
   String.prototype.capitalize = function() {
     return this.replace(/\w+/g, function(str) {
       return (str.charAt(0).toUpperCase() + str.substr(1));
     });
   };
   String.prototype.trim = function() {
     return this.replace(/^\s+|\s+$/g, '');
   };
   

9. indexOf(elem)

   Array.prototype.indexOf = Array.prototype.indexOf || function(elem) {
     for(var i in this){
       if(this[i] === elem) return true;  
     return false;
   };