Get single object from array using JavaScript functions [duplicate]

Question

I have this array of objects:

var frequencies = [{id:124,name:'qqq'}, 
                  {id:589,name:'www'}, 
                  {id:45,name:'eee'},
                  {id:567,name:'rrr'}];

I need to get an object from the array above by the id value.

For example I need to get the object with id = 45.

I tried this:

var t = frequencies.map(function (obj) { return obj.id==45; });

But I didn't get the desired object.

How can I implement it using JavaScript prototype functions?

Nenad Vracar · Accepted Answer · 2016-07-20 12:56:23Z

32

If your id's are unique you can use find()

var frequencies = [{"id":124,"name":"qqq"},{"id":589,"name":"www"},{"id":45,"name":"eee"},{"id":567,"name":"rrr"}];
                  
var result = frequencies.find(function(e) {
  return e.id == 45;
});

console.log(result)

answered Jul 20, 2016 at 12:56

Nenad Vracar

122k16 gold badges160 silver badges184 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Philipp Over a year ago

Great! find() is perfect as it only returns a single entry from an array :-)

Satpal · Accepted Answer · 2016-07-20 13:16:28Z

23

You need filter() not map()

var t = frequencies.filter(function (obj) { 
    return obj.id==45; 
})[0];

edited Jul 20, 2016 at 13:16

answered Jul 20, 2016 at 12:54

Satpal

134k13 gold badges168 silver badges171 bronze badges

5 Comments

Michael Over a year ago

Is filter method works in InternetExplorer?

Felix Kling Over a year ago

@Michael: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… .

Michael Over a year ago

Filter method return array(a single object array), any idea how can return object not array?

Asif Ur Rahman Over a year ago

Yes. As filter will return an array. So you can easily user array[0] to get the product. That means if an array of single object is like singleObjectArray = [{name: "laptop"}]... You can easily extract the object from the array like-- singleObject = singleObjectArray[0];

Travis Reeder Over a year ago

You should use find because it returns the object instead of an array.

Collectives™ on Stack Overflow

Get single object from array using JavaScript functions [duplicate]

2 Answers 2

1 Comment

5 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

5 Comments

Linked

Related