Find object by property in JSON array

Question

I have problem with get string in JSON data. Format as below:

[
  { "name": "Alice", "age": "20" },
  { "id": "David", "last": "25" },
  { "id": "John", "last": "30" }
]

Sometime it changes position together, John from 3rd place go to 2nd place:

[
  { "name": "Alice", "age": "20" },
  { "name": "John", "age": "30" },
  { "name": "David", "age": "25"}
]

If i use data[3].age to get John's age, and data change position, I will get David's age.

Is there any method I can use to find the object with name David and get the age value?

Possible duplicate of Find object by id in an array of JavaScript objects — Mark
– Mark, Commented May 6, 2018 at 6:12

Sajeetharan · Accepted Answer · 2018-05-06 06:21:58Z

9

You can use array.find() method as,

var myArray = [
  {
    "name": "Alice",
    "age": "20"
  },
  {
    "name": "John",
    "age": "30"
  },
  {
    "name": "David",
    "age": "25"
  }
];

//Here you are passing the parameter name and getting the age 
//Find will get you the first matching object
var result = myArray.find(t=>t.name ==='John').age;
console.log(result);

edited May 6, 2018 at 6:21

answered May 6, 2018 at 6:12

Sajeetharan

223k65 gold badges370 silver badges409 bronze badges

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

1 Comment

Hieu Nguyen Over a year ago

Work like charm. Thank you very much.

Firemen26 · Accepted Answer · 2018-05-06 06:40:39Z

5

It's better to use array.filter() (better browser support)

myArray.filter(function(el){return el.name == "John"})[0].age

answered May 6, 2018 at 6:40

Firemen26

1,05512 silver badges21 bronze badges

1 Comment

xyres Over a year ago

Although Array.filter has better browser support than Array.find, I'd like to point out that find will return when it finds a match, whereas filter will go through every item in the array. So, it will perform worse if the array is large. In those cases, regular for loop with break statements should be preferred.

Collectives™ on Stack Overflow

Find object by property in JSON array

2 Answers 2

1 Comment

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related