CODEWITHSUNDEEP
javascriptarrays
guywhogames
guywhogames

Reputation: 41

Deleting input item of array javascript

I need to write a function that will delete the number or item entered in the input box. Heres what I have so far... 

const my_arr = [1, 2, 3, 9]

function my_set_remove(my_arr, value) {
  let result = [];
  for (let i = 0; i < my_arr.length; i++) {
    result = my_arr[i];
    if (my_arr[i] == value) {
      let new_arr = my_arr.pop[i];

      return new_arr;
    }
  }
}
console.log(my_set_remove(my_arr, 9));

When I console.log it says undefined. Thanks in advance for your help

Upvotes: 1

Views: 62

Answers (3)

Alexandr Erokhov
Alexandr Erokhov

Reputation: 183

ES6 reduce for solution

const my_arr = [1, 2, 3, 9]

function my_set_remove(my_arr, value){
  return my_arr.reduce((acc, rec) => {
    if (rec !== value) {
      return acc.concat(rec)
    }
    return acc
  },[])
}
console.log(my_set_remove(my_arr, 9 ))

Upvotes: 0

Yishai Nachliel
Yishai Nachliel

Reputation: 73

Using filter seems to be what you need:

const my_arr = [1, 2, 3, 9]

function my_set_remove(my_arr, value) {
    return my_arr.filter((original_val) => original_val !== value)
}

console.log(my_set_remove(my_arr, 9));

Upvotes: 0

Alex L
Alex L

Reputation: 4241

From your comment you say:

This is for a class, so I am limited on what I can use. Im only allowed .length, .pop and .push, nothing else

So with that in mind, I try to stick to what you started with and make it work (although there are plenty of other ways to do it too):

you just need to push all items from your input array to your output/result array that do not equal your value you want to remove, and then at the end return that output/result array. Your input array remains unchanged.

Any questions, let me know.

const my_arr = [1, 2, 3, 9]

function my_set_remove(my_arr, value) {
  let result = [];
  for (let i = 0; i < my_arr.length; i++) {
    if (my_arr[i] != value) {
      result.push(my_arr[i]);
    }
  }
  return result;
}
console.log(my_set_remove(my_arr, 9));

Output:

[1, 2, 3]

Upvotes: 1

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