How can I convert an array of numbers to strings?

Question

I can't convert array's numbers into strings. What is wrong with my code?

I also tried: this.userIds.toString().split(',')

collectIds() {
  this.array.forEach((e, i) => {
    // [8, 8, 8, undefined, undefined, undefined]
    if (this.array[i].details.user_id !== undefined) {
      this.userIds.push(this.array[i].details.user_id)
      // [8, 8, 8]
    }
  });
  
  this.userIds.map(e => e.toString())
  console.log("userIds: ", this.userIds)
  // [8, 8, 8]
}

Please add an array to the snippet demo above so we can see the output. — isherwood
– isherwood, Commented Jul 20, 2023 at 14:06
this.userIds = this.array.filter( x => x!== undefined).map(x => x.toString()); — epascarello
– epascarello, Commented Jul 20, 2023 at 14:13

Unmitigated · Accepted Answer · 2023-07-20 14:05:51Z

1

map creates a new array with the transformed elements. It does not modify the old one.

You could reassign this.userIds to the new array.

this.userIds = this.userIds.map(e => e.toString());

Or you could use forEach and mutate the array while iterating.

this.userIds.forEach((e, i, a) => a[i] = e.toString());

answered Jul 20, 2023 at 14:05

Unmitigated

91.5k12 gold badges103 silver badges109 bronze badges

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

1 Comment

monny Over a year ago

I used forEach method, thank you!

Insyte · Accepted Answer · 2023-07-20 14:05:36Z

0

Array.prototype.map() returns a new array.

You will need to reassign this.userIds if this is your intention.

this.userIds = this.userIds.map(e => e.toString())

answered Jul 20, 2023 at 14:05

Insyte

2,2382 gold badges20 silver badges28 bronze badges

Collectives™ on Stack Overflow

How can I convert an array of numbers to strings?

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related