Typescript item of an array

Question

I have an array, like

Array[{id:0,name:"a"},{id:1,name:"b"}...]

I have an other array, let's call it Array2, in Array2 I want those items from Arraywhere the id = given number.
I'm trying this with a function like:

saveActualComment() {
    var i = 0;
    for (i = 0; i < this.postComments.length; i++) {
      if (this.postComments[i].postid = this.post.id) {
        this.actualComments.push(this.postComments[i]);
      }
    }
  }

Where postCommets is the Array, and actualComments is the Array2.
Problem is, that this function always gives me back the whole array, not only those items where the Array.id is the given number (post.id)

Have you tried to use compare operator instead of assigning value? — yurzui
– yurzui, Commented Jul 12, 2018 at 19:32
Yes, as mentioned you are assigning to this.postComments[i].postid instead of comparing its value. Use a double or triple equals instead, eg: if (this.postComments[i].postid === this.post.id) { ... } — CRice
– CRice, Commented Jul 12, 2018 at 19:37
@Skickpause not sure if typo but it should be == in the if clause. — Ploppy
– Ploppy, Commented Jul 12, 2018 at 19:37

Nitin Walia · Accepted Answer · 2018-07-12 19:37:00Z

3

if (this.postComments[i].postid = this.post.id) {
        this.actualComments.push(this.postComments[i]);
      }

in above code use == instead of =

this.postComments[i].postid == this.post.id

or you can do this

this.actualComments = this.postComments.filter((item) => item.postId === this.post.id);

answered Jul 12, 2018 at 19:37

Nitin Walia

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2 Comments

user10037542 Over a year ago

Thank you :) So it was just a typo.., and thank you for the other solution, I haven't known that I can do this Array.filter

Nitin Walia Over a year ago

yeah you can do more then just filter.. look at this tutorial medium.com/poka-techblog/…

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