Nodejs Array Index indexOfKey(key)

Method Source Code

Array.prototype.indexOfKey = function(key){
   for(var i in this) if(i == key) return i;
   return -1;// w w w  .ja  va 2  s . c  o m
}

Related

1. indexOfByKey(aKey)

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

2. indexOfByProp(obj, property)

   Array.prototype.indexOfByProp = function(obj, property) {
     let result = -1;
     this.forEach(function(currentObj, index) {
       if (currentObj[property] === obj[property]) {
         result = index;
     });
     return result;
   };
   ...
   

3. 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
   ...
   

4. 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;
   

5. 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;
   

6. 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;
   

7. indexOfMatchFunction(func)

   Array.prototype.indexOfMatchFunction = function(func) {
       "use strict";
       for (var i in this) {
           if (!this.hasOwnProperty(i))
               continue;
           var element = this[i];
           if (func(element))
               return parseInt(i);
       return -1;
   };
   

8. 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;
   };
   

9. 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;