Nodejs Array Value defaultIfEmpty(val)

Method Source Code

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

Related

1. aggregate(initialValue, aggregateItemCallback)

   Array.prototype.aggregate = function (initialValue, aggregateItemCallback) {
     var result = initialValue; 
     this.each(function (item) {
       result = aggregateItemCallback(result, item);
     })
     return result;
   

2. allValuesSame()

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

3. allValuesSame()

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

4. allValuesSame()

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

5. byField(field, value)

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

6. 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;
   };
   

7. first(attribut, value)

   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];
       return null;
   };
   

8. getNextValue(index)

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

9. 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;
   };
   ...