JavaScript while Loop

The while loop in JavaScript allows you to repeatedly execute a block of code as long as a specified condition remains true. It’s especially useful when the number of iterations isn't known in advance.

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Syntax

• The condition is checked before each iteration.
• If it's true, the loop body executes.
• If it's false, the loop stops.

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Example 1: Basic While Loop

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Example 2: Countdown Using While

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Example 3: Infinite Loop (Use Cautiously)

⚠️ Be careful: An infinite loop can freeze your browser or crash your script.

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Example 4: Using continue Inside a While Loop

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When to Use a while Loop

• When you don't know ahead of time how many times to run.
• When you're waiting for a condition to be met.
• Useful in scenarios like polling APIs, validating user input, or simulating long-running processes.

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Key Takeaways

• The while loop runs as long as the condition evaluates to true.
• You must update the loop variable to avoid infinite repetition.
• Use break to exit early and continue to skip specific iterations.
• Ideal for cases where loop conditions are dynamic or unpredictable.