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132

Efficient way of iterating over a array of objects in javascript/node.js

rated 0 times [ 138] [ 6] / answers: 1 / hits: 18325 / 8 Years ago, fri, january 29, 2016, 12:00:00

I've defined an object

var Person = function(name,age,group){

this.name = name,

this.age = age,

this.group = group

}



var ArrPerson = [];

ArrPerson.push(new Person(john,12,M1));

ArrPerson.push(new Person(sam,2,M0));

Now I need an efficient mechanism to identify if the array of objects ArrPerson contains a particular name or not?

I know we can iterate over the array using for loop and check.Assuming the array is huge,is there any other efficient way of doing this?

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mustafaericho

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answered 8 Years ago yesseniadajab · Accepted Answer

use ES5 array methods like map ,filter ,reduce etc

use forEach

native for loop

Example : filter , map, reduce etc. methods iterate over each item or object in an array,

ArrPerson.filter(function(item){

       console.log(item)

   });

forEach : also iterates over each item/object in an array

 ArrPerson.forEach(function(key,value){

     console.log(key);

     console.log(value)

  })

The question said huge array , so

native for loop is way faster than any of the above and caching the length can improve by a few ms (milliseconds).

https://jsperf.com/native-map-versus-array-looping

for(var i = 0, len = ArrPerson.length; i < len; i++){



}