Nodejs Array Value first(attribut, value)

Method Source Code

Array.prototype.first = function (attribut, value) {
    for (var i = 0; i < this.length; i++) {
        if (this[i][attribut] == value)
            return this.slice(i, i + 1)[0];
    }//  w w  w.java 2  s . co m

    return null;
};

Related

1. allValuesSame()

   Array.prototype.allValuesSame = function() {
     for(var i = 1; i < this.length; i++)
       if(this[i] !== this[0])
         return false;
     return true;
   

2. allValuesSame()

   var canvas = {};
   Array.prototype.allValuesSame = function() {
     for(var i = 1; i < this.length; i++) {
         if(this[i] !== this[0])
             return false;
     return true;
   

3. byField(field, value)

   Array.prototype.byField = function(field, value) {
     return this.filter(function ( obj ) {
       return obj[field] == value;
     })[0]
   

4. defaultIfEmpty(val)

   Array.prototype.defaultIfEmpty = function (val) {
     return this.length == 0 ? [val == null ? null : val] : this;
   };
   

5. elementWithAttr(attr, value)

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

6. getNextValue(index)

   Array.prototype.getNextValue = function(index) {
     let nextIndex = index + 1;
     if(nextIndex < this.length) {
       return this[nextIndex];
     return null;
   

7. hasWhere(property, value)

   Array.prototype.hasWhere = function (property, value) {
       "use strict";
       for(var i = 0; i < this.length; i++) {
           if(this[i][property] === value) {
               return true;
       return false;
   };
   ...
   

8. iReduce(handler, initialValue)

   var ary = [0,1,2,3,4,5,6,7,8,9];
   var initialValue;
   Array.prototype.iReduce = function(handler, initialValue) {
     if (typeof handler !== 'function') {
       throw new Error(handler + 'is not a function!');
     var ary = this;
     var i = 0;
     var tempCurrent = initialValue;
   ...
   

9. makeArray(value){

   Array.makeArray = function(value){
     if ( !value ) return [];
     if ( typeof value == "string" ) return [value];
     return Array.prototype.slice.call(value, 0);
   };