Delete 2nd to last item array

Question

I am trying to delete the 2nd to last item in my array. Using delete puts my indexing out of order?

Getting this using delete myArr[15];

You could copy the last element's value to the second last, and then delete the last element in the array — GTBebbo, May 02 '20 at 20:33
I am not sure what you mean. How do you mean delete it but not put the array out of order? Also, you usually use the "splice" directive for deleting something in array in JavaScript. I didn't even know JavaScript had "delete" keyword. — FlatAssembler, May 02 '20 at 20:34

score 2 · Accepted Answer · answered May 02 '20 at 20:34

2

You can use splice method instead. This is an example:

let arr = [1,2,3];
arr.splice(-2,1);
console.log(arr);

answered May 02 '20 at 20:34

Majed Badawi

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Ashish Ranjan · Answer 2 · 2020-05-02T21:35:06.903

1

Delete is a method of an Object and it would delete a key(and so the value) of an Object. In an Array, the key would be the index.

An easy way to do this for Array would be something like:

myArr.splice(myArr.length - 2, 1);

Or better:

myArr = [...myArr.slice(0, - 2), ...myArr.slice(-1)]

edited May 02 '20 at 21:35

answered May 02 '20 at 20:33

Ashish Ranjan

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27
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score 0 · Answer 3 · answered May 02 '20 at 20:38

If you need to delete from the second value onwards in an array, isn't it better for you to create a new array with only the first value?

Here is an example:

let anArray = [
  'oneValue',
  'twoValue',
  'threeValue',
  'ecc'
];

console.log('anArray', anArray);

let aNewArray = [anArray[0]];

console.log('aNewArray', aNewArray);

Delete 2nd to last item array

3 Answers3