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Why Does My `setTimeout` Function Execute Immediately?

Dec 20, 2024 am 12:05 AM

Why Does My `setTimeout` Function Execute Immediately?

Why the Premature Execution of setTimeout?

When attempting to execute a setTimeout function, users may encounter an issue where the function is executed immediately instead of waiting the specified amount of time. This unexpected behavior stems from an error in the function call syntax.

In the provided code:

setTimeout(testfunction(), 2000);
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The function testfunction is invoked immediately by adding parentheses () after its name. To remedy this issue, remove the parentheses, allowing the setTimeout function to schedule the execution of testFunction after 2000 milliseconds.

The correct syntax is:

setTimeout(testFunction, 2000);
                       ^
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By removing the parentheses, setTimeout registers testFunction for execution after the specified delay, ensuring its intended delayed behavior.

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