Nodejs Array Find find_by(prop, val)

Method Source Code

// Find an object in an array of objects using
// a property-value
// Prerequisite: Array.prototype.first

Array.prototype.find_by = function(prop, val) {
  return this.filter(function(obj) {
    return obj[prop] === val
  }).first()/*www. ja  v  a 2s .  c o m*/
}

Related

1. findInJson(attr, value)

   Array.prototype.findInJson = function (attr, value){
     for(var i=0; i<this.length; i++){
       this[i][attr] = this[i][attr].toLowerCase();
       if(this[i][attr] == value){
         return true;
       };
     };
     return false;
   };
   ...
   

2. findMaximumfindIt()

   var array = [47, 98, 0, -23, 4, 87.3, 0.0003, +9];
   Array.prototype.findMaximum = function findIt() {
   var arrayValue = 0;
   for(var i = 0; i < array.length; i++) {
     if (array[i] > arrayValue) {
       arrayValue = array[i];
     return arrayValue;
   ...
   

3. findRanges()

   Array.prototype.findRanges = function() {
     var buckets = {};
     for(var i = 0; i < this.length; i++) {
       if(!(this[i] in buckets)) {
         buckets[this[i]] = [{
           from: i,
           to: i
         }]
       } else {
   ...
   

4. findThing(n)

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

5. findYoungestPersonfindYoungestPerson()

   Array.prototype.findYoungestPerson = function findYoungestPerson() {
           var youngest = this[0];
       for (var person = 1; person < this.length; person += 1) {
           if (this[person].age < youngest.age) {
               youngest = this[person];
       return youngest;
   };
   ...