Nodejs Array Value hasWhere(property, value)

Method Source Code

Array.prototype.hasWhere = function (property, value) {
    "use strict";

    for(var i = 0; i < this.length; i++) {
        if(this[i][property] === value) {
            return true;
        }// w w  w .  ja  v  a2  s. c o  m
    }

    return false;
};

Related

1. byField(field, value)

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

2. defaultIfEmpty(val)

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

3. 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;
   };
   

4. 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;
   };
   

5. getNextValue(index)

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

6. 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;
   ...
   

7. makeArray(value){

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

8. nIndexOf(value)

   Array.prototype.nIndexOf = function(value){
       var firstIndex = 0,
           lastIndex = this.length - 1,
           middleIndex = Math.floor((lastIndex + firstIndex) / 2);
       while (this[middleIndex] != value && firstIndex < lastIndex) {
           if (value < this[middleIndex]) {
               lastIndex = middleIndex - 1;
           } else if (value > this[middleIndex]) {
               firstIndex = middleIndex + 1;
   ...
   

9. oneValue()

   Array.prototype.oneValue = function()
       var max = this[0];
       for(el in this)
           if(this[el] !== max && !isNaN(this[el]))
               return false;
       return true;
   };