🚀 JavaScript setTimeout with var – A Tricky Scenario #JavaScript interview questions #trending#viral

In JavaScript, using var inside a for loop with setTimeout can lead to unexpected results due to function scoping. When the setTimeout callback executes after 1 second, the loop has already completed, and i is equal to 4. Since arr[4] is undefined, it prints undefined four times instead of the expected numbers.

To fix this issue, we can use let (which is block-scoped) or an Immediately Invoked Function Expression (IIFE) to create a separate scope for each iteration.

Using let ensures the correct value of i is captured.
Using an IIFE immediately stores the current i value in a separate execution context.

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