Nodejs Array Index index(val)

Method Source Code

"use strict";/*from w w w . j  ava  2  s.com*/

Array.prototype.index = function(val) {
  for(var i = 0, l = this.length; i < l; i++) {
    if(this[i] == val) return i;
  }
  return null;
};

Related

1. indexOf(value)

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

2. indexOf(value)

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

3. indexOf(value, begin, strict)

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

4. indexOf(what, i)

   Array.prototype.indexOf = function(what, i) {
           i = i || 0;
           var L = this.length;
           while (i < L) {
               if(this[i] === what) return i;
               ++i;
           return -1;
       };
   ...
   

5. index(val)

   Array.prototype.index = function(val) {
     for(var i = 0, l = this.length; i < l; i++) {
       if(this[i] == val) return i;
     return null;
   };
   

6. indexOfAttr(attr, value)

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

7. indexOfByFunction(filter)

   Array.prototype.indexOfByFunction = function (filter) {
       return indexOfByFunction(this, filter);
   };
   

8. indexOfById(id)

   Array.prototype.indexOfById = function(id){
     var index = -1,
       i = 0,
       l = this.length,
       item;
     for(; l--; i++){
       item = this[i];
       if(parseInt(item.id) === id)
         return i;   
   ...
   

9. indexOfByKey(aKey)

   Array.prototype.indexOfByKey = function(aKey) {
       for(var i = 0; i < this.length; i++) 
           if(this[i].getKey() === aKey)
               return i;
       return -1;
   };