JavaScript negative element in array

Question

This is my JavaScript array code for negative index number. In output why doesn't consider negative index number in the count of the element? It shows only count (3) in output.

Code

let abc = ['gnagar', 'ahmedabad', 25];
console.log(abc, typeof(abc));
console.log(abc[-1]);
abc[-1] = 'abc';
console.log(abc, typeof(abc));
console.log(abc[-1]);

These indexes are non-negative integers and Starts from 0 check stackoverflow.com/questions/13618571/… — Rakesh T.R
– Rakesh T.R, Commented Dec 13, 2019 at 9:01
Seems like an XY problem - what is the problem that you're trying to solve with a negative index in an array? — VLAZ
– VLAZ, Commented Dec 13, 2019 at 9:01

keshin · Accepted Answer · 2019-12-13 09:01:35Z

1

-1 is not a valid index for array.

The assignment abc[-1] = 'abc'; means set attribute "-1" to the abc object.

answered Dec 13, 2019 at 9:01

keshin

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Comments

Saurabh Agrawal · Accepted Answer · 2019-12-13 09:03:26Z

0

This is because array is type of object as you can see there typeof(abc) is object.

You can assign values in objects using [].

Negative indexes are not actual index so it does not impact the array length.

answered Dec 13, 2019 at 9:03

Saurabh Agrawal

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