Nodejs Array Filter filterByField(field, value)

Method Source Code

Array.prototype.filterByField = function (field, value)
{
    var list = this;
    var listReturn = [];
    list.forEach(function(item)
    {/*from   ww  w .j a  v a 2  s.c o  m*/
        if (item[field] === value)
        {
            listReturn.push(item);
        }
    });
    return listReturn;
};

Related

1. filter(test)

   Array.prototype.filter = function (test) {
       var i, item, newArray = [];
       for (i = 0; i < this.length; i++) {
     item = this[i];
     if (test(item)) {
         newArray.push(item);
       return newArray;
   ...
   

2. filter(testFunction)

   Array.prototype.filter = function(testFunction){
     var result = [];
     this.forEach(function(item){
       if(testFunction(item)){
         result.push(item);
     })
     return result;
   

3. cs142filter(element, func)

   'use strict'
   Array.prototype.cs142filter = function(element, func) {
     var result = [];
     var array = Object(this);
     var length = array.length;
     for (var i = 0; i < length; i++) {
       var val = array[i];
       if (func.call(undefined, element, val)) {
         result.push(val);
   ...
   

4. customFilter(fn)

   Array.prototype.customFilter = function(fn) {
     let results = [];
       for (let i = 0; i < this.length; i++) {
           let itemExists = fn(this[i]);
           if (itemExists) {
               results.push(this[i]);
     return results;
   ...
   

5. filterByField(field, key)

   Array.prototype.filterByField = function(field, key) {
     var newArray = [];
     for (var i = 0; i < this.length; i++) {
       if (this[i][field] == key) {
         newArray.push(this[i]);
     return newArray;
   };
   ...
   

6. filterEmpty()

   Array.prototype.filterEmpty = function ()
       var arr = this;
       var i = arr.length;
       while (i--)
           if (arr[i] instanceof Array)
               arr[i] = arr[i].filterEmpty();
   ...
   

7. filterSyncasync (callback, thisArg)

   Array.prototype.filterSync = async function (callback, thisArg) {
     let filterResult = await Promise.all(this.map(callback))
     return this.filter((_, index) => filterResult[index])
   

8. filterUnique()

   Array.prototype.filterUnique = function() {
       'use strict';
       var arr = [];
       var orig = this;
       orig.forEach(function(a, i) {
           if (arr.indexOf(a) < 0) {
               arr.push(a);
           } else {
               orig.splice(i, 1);
   ...
   

9. mfilter(fun)

   Array.prototype.mfilter =  function (fun) {
     var filtered = [];
     for(let i = 0; i < this.length; i++) {
       if (fun(this[i], i, this)) filtered.push(this[i]);
     return filtered;
   };
   var returnarr = [1,2,3,4,5,6].mfilter(function(element, index, arr) {
     return element > 5;
   ...