i try to delete a index from an array javascript, but its not working

Question

here is my code

subjectData = [
     {name: 'a'},
     {name: 'b'},
     {name: 'c'},
]


eachStudent.subjectName= [
    'b', 'c'
]


this.eachStudent.subjectName.forEach((v) => {
  let index = this.subjectData.map((el) => el.name.toLowerCase()).indexOf(v.toLowerCase());
      if (index > -1) {
         this.subjectData.splice(index, 1)
      }
})

I want to remove indexs from subjectData which is exist in eachStudent.subjectName

and when i console el.name and v I found that one el is similar but always return -1

Plz help

Can you please create a minimal reproducible example, preferably using a code snippet — Nick Parsons
– Nick Parsons, Commented Jan 8, 2021 at 3:12
Array.filter is the way to do this. But you are also modifying the very list you are iterating over, which is not recommended. Try to use the functional-style methods of Array for these types of problems and all of these issues usually go away. — Victor Zamanian
– Victor Zamanian, Commented Jan 8, 2021 at 7:57

Yair Cohen · Accepted Answer · 2021-01-08 03:25:34Z

4

It's so much easier to do this with a one liner using filter:

subjectData = subjectData.filter((item => !subjectName.includes(item.name)));

Here's a working stackblitz:

https://stackblitz.com/edit/js-tly2yl

answered Jan 8, 2021 at 3:25

Yair Cohen

2,28111 silver badges16 bronze badges

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

Collectives™ on Stack Overflow

i try to delete a index from an array javascript, but its not working

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related