Check if an array contains values from object and return them?

Question

I have an Array, say something like that:

var array = [{something:"a"},{something:"b"},{something:"c"}]

I now want to get the Object which contains "b". How can I do that?

Here's what I tried finding before : I found out array.filter and array.find with includes but I couldn't get a way on how to use it on a String inside Object inside an Array and not just strings inside an Array.

`array.find(x => x.something.includes("b"))` for partial match or `array.find(x => x.something === "b")` for exact match. — VLAZ, Apr 20 '21 at 11:38
Both `filter` and `find` pass the element into the callback function. The array element is your object, so now all you need to do, is access a specific property of that object. What the example from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter does with the `length`, you want to do with `b`. — CBroe, Apr 20 '21 at 11:39

Vendel Serke · Accepted Answer · 2021-04-20T11:41:59.337

2

This will return the object as you asked (In case if it existing)

let resultWithSomethingB = array.filter(element => element.something === 'b')[0];

edited Apr 20 '21 at 11:41

answered Apr 20 '21 at 11:39

Vendel Serke

135
11

And what if array is empty? – nafas Apr 20 '21 at 11:41
1

@nafas the result would be `undefined`. – VLAZ Apr 20 '21 at 11:41
@VLAZ I thought this would throw exception not undefined... I might be wrong!!! – nafas Apr 20 '21 at 11:44
1

@nafas filtering an empty array returns an empty array. Getting the first item of an empty array returns `undefined`. – VLAZ Apr 20 '21 at 11:44

score 1 · Answer 2 · answered Apr 20 '21 at 11:39

1

Use the array function filter to accomplish this:

var array = [{something:"a"},{something:"b"},{something:"c"}];

// Filter array based on .something
console.log(array.filter(a => { return a.something === "b" }))

answered Apr 20 '21 at 11:39

Wimanicesir

4,606
2
11
30

score 1 · Answer 3 · answered Apr 20 '21 at 11:40

In that case you can use array.filter:

let newObject = null;

const newArray = array.filter(function(item) {
    // Return an item if the something property is a "b"
    return item.something === "b";
});

if (newArray.length > 0) {
    // Returns the first element
    newObject = newArray[0];
}

// Use the newObject

Check if an array contains values from object and return them?

3 Answers3