Angular / Javascript search array for object key

Question

For the purpose of example lets have the following object:

var myobj = {id: 1, text: 'hello world', user_id: 5}

Now lets say we have an array:

var objectContainer = []

And we fill this objectContainer with x number of myobj

Now we wish to find the myobj that has the id value set to 30

You could use a loop but in worst case you would have to loop through the whole array before finding your value.

So my question is does JaVaScript have a function for these situations or does AngularJsprovide additional helpers to solve this?

@Hacketo can this be used to retrieve the item in a controller / service? — Marc Rasmussen
– Marc Rasmussen, Commented Jun 30, 2015 at 10:04

antoinestv · Accepted Answer · 2015-06-30 11:52:22Z

1

You have a lot of different solutions :

Javascript FIND : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find Example : var myobject = objectContainer.find(function(value){ return value.id === 1; });
Angular filter : https://docs.angularjs.org/api/ng/filter/filter
If your ids are unique you could also use a map instead of an array :

Exemple :

var myobj = {id: 1, text: 'hello world', user_id: 5};

var objectContainer = {};

objectContainer[myobj.id] = myobj;

etc

edited Jun 30, 2015 at 11:52

answered Jun 30, 2015 at 10:12

antoinestv

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2 Comments

Hacketo Over a year ago

find is es6 . Also you should provide english links on StackOverflow.

antoinestv Over a year ago

Indeed but you can still provide an implementation of find.

Nikki · Accepted Answer · 2015-06-30 10:02:51Z

0

Your value of 'x' is the array indexer. So objectContainer[29] should point to the myobj in the 30th position.

answered Jun 30, 2015 at 10:02

Nikki

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2 Comments

Marc Rasmussen Over a year ago

Yeah that would be true if you put them in cronologicly but if you put them in at random this would not

Nikki Over a year ago

try Array.findIndex("what you want to search);

Community · Accepted Answer · 2017-05-23 12:30:02Z

0

Also you can use my solution of finding objects in an array. But still it will loop over all elements of an array.

edited May 23, 2017 at 12:30

CommunityBot

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answered Jun 30, 2015 at 10:34

Vladimir

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