JavaScript detecting negative elements within an array

This JavaScript array code deals with negative index numbers. However, the output does not include the negative index number in the count of elements, only displaying a count of 3.

Sample 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]);

Answer №1

-1 is an invalid array index.

In the statement abc[-1] = 'abc';, -1 attribute is being assigned to the abc object.

Answer №2

The reason for this behavior is that the variable array is considered as an object in JavaScript, which is evident from using typeof(abc).

In objects, you can assign values using square brackets like [].

Negative indexes do not correspond to actual elements in the array, so they do not affect the length of the array.

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