How JavaScript Execution Context Works

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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

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Before code runs, JavaScript creates the Global Execution Context. It has memory creation phase and code execution phase.

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▲Global Execution Context

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Global Context

0 variables

No variables in memory

Console Output

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varfnobjarrclosure

Code Preview

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