Nodejs Array Index indexOfMatchFunction(func)

Method Source Code

Array.prototype.indexOfMatchFunction = function(func) {
    "use strict";

    for (var i in this) {
        if (!this.hasOwnProperty(i))
            continue;/*w ww . j av a  2s .  c  o m*/

        var element = this[i];

        if (func(element))
            return parseInt(i);
    }
    return -1;
};

Related

1. indexOfContent(searchTerm)

   Array.prototype.indexOfContent = function (searchTerm) {
     let index = -1;
     for (var i = 0, len = this.length; i < len; i++) {
       if (this[i].content == searchTerm) {
         index = i;
         break;
     return index
   ...
   

2. indexOfElement(search, func)

   Array.prototype.indexOfElement = function(search, func) {
     for(var i = 0; i < this.length; i++) {
       var result = func(search, this[i]);
       if(result)
          return i;
     return -1;
   

3. indexOfGreatestLessThan(val)

   Array.prototype.indexOfGreatestLessThan = function(val) {
     var minIndex = 0;  
     var minDist = Number.MAX_VALUE;
     for (var i = 0; i < this.length; i++) {
       if ((this[i] <= val) && (Math.abs(this[i] - val) < minDist)) {
         minDist = Math.abs(this[i] - val);
         minIndex = i;
     return minIndex;
   

4. indexOfKey(key)

   Array.prototype.indexOfKey = function(key){
     for(var i in this) if(i == key) return i;
     return -1;
   

5. indexOfLeastGreaterThan(val)

   Array.prototype.indexOfLeastGreaterThan = function(val) {
     var minIndex = 0;  
     var minDist = Number.MAX_VALUE;
     for (var i = 0; i < this.length; i++) {
       if ((this[i] >= val) && (Math.abs(this[i] - val) < minDist)) {
         minDist = Math.abs(this[i] - val);
         minIndex = i;
     return minIndex;
   

6. indexOfObject(key, value)

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

7. indexOfObject(myArray, searchTerm, property)

   Array.prototype.indexOfObject = function (myArray, searchTerm, property) {
       for(var i = 0, len = myArray.length; i < len; i++) {
           if (myArray[i][property] === searchTerm) 
           return i;
       return -1;
   

8. indexOfObject(obj)

   Array.prototype.indexOfObject = function(obj) {
     for ( var i = 0, len = this.length; i < len; i++) {
       if (angular.equals(this[i], obj))
         return i;
     return -1;
   };
   

9. indexOfObject(prop, val)

   Array.prototype.indexOfObject = function(prop, val) {
     function traverseObject(obj) {
       if(typeof(obj) === 'object') {
         for(var e in obj) {
           if(obj[prop] == val) {
             return true;
           } else {
             return traverseObject(obj[e]);
       return false;
     for(var i = 0; i < this.length; i++) {
       if(this[i] == val) {
         return i;
       } else if(traverseObject(this[i])) {
         return i;
     return -1;
   };