How to check if value exist in a json array javascript

Question

I have the following Structure:

_id: 'blog',
    posts: [
      {
        _id: 'politics and economy',
        name: 'politics and economy',
        author: 'Mark',
      },
      {
        _id: 'random',
        name: 'random',
        author: 'Michael'
      }
    ]

My if Statement:

if(posts.name.includes("politics"){
//Doing Stuff
}

How Can I get this running? I do not know the length of the Array.

You can use the array filter method developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… to get the items from the array that match your criteria. — szczocik
– szczocik, Commented Oct 14, 2020 at 12:45
Does this answer your question? How do I check if an array includes a value in JavaScript? — JK.
– JK., Commented Oct 15, 2020 at 22:55

Cedric Cholley · Accepted Answer · 2020-10-14 12:53:31Z

2

No need to know the length, you can use forEach

posts.forEach(post => {
    if(post.name.includes("politics")){
        //Doing Stuff
    }
});

edited Oct 14, 2020 at 12:53

answered Oct 14, 2020 at 12:47

Cedric Cholley

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2 Comments

John Sneijder Over a year ago

you miss a ')' in the if statement

Cedric Cholley Over a year ago

@JohnSneijder You are right (I've copied/pasted the code from the question) It has been corrected. thx

Blu · Accepted Answer · 2020-10-14 13:22:48Z

1

You can use the method some to check if one of the posts has the value

var name = "politics";
posts.some(singlePost => {
     return singlePost.name == name;
});

edited Oct 14, 2020 at 13:22

Blu

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answered Oct 14, 2020 at 12:48

Tomer Levitski

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Comments

NinjaDev · Accepted Answer · 2020-10-14 12:48:08Z

0

if(posts.filter(post => post.name.includes("politics")).length > 0){
//Doing Stuff
console.log("One of posts has a name including politics")
}

answered Oct 14, 2020 at 12:48

NinjaDev

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Comments

Dipankar Maikap · Accepted Answer · 2020-10-14 12:54:36Z

0

const posts = [
      {
        _id: 'politics and economy',
        name: 'politics and economy',
        author: 'Mark'
      },
      {
        _id: 'random',
        name: 'random',
        author: 'Michael'
      }
    ]

posts.forEach(post => {
if(post.name.includes("politics")){
//Do Your Stuff
console.log(post.name)
}
});

You have to loop through the posts array.

answered Oct 14, 2020 at 12:54

Dipankar Maikap

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Comments

Blu · Accepted Answer · 2020-10-14 13:21:54Z

0

Use the array filter method. Link

edited Oct 14, 2020 at 13:21

Blu

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answered Oct 14, 2020 at 12:47

user14261177

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