Lab

IIFE — Immediately Invoked Function Expression

medium
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Step Explanation

Understand what is happening first

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Execution Visualizer

Watch memory, stack, queues, and output

Execution Visualizer

live
The outer () around the function converts it from a declaration to an expression. Without this, JavaScript would see 'function()' and throw a SyntaxError because anonymous function declarations are not allowed.

Call Stack

1 frame
TOP ↑
▲main()
frame 0
↓ BOTTOM
Global Context

Memory

1 variable

Stack Memory

resultvarnew
"TDZ"
Console Output

awaiting output...

varfnobjarrclosure

Code Preview

Active line 6

Code

line 6
JavaScript
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