Modal
- Display extra info without leaving the page.
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Booleans
- Used for on/off, yes/no, or visible/hidden logic.
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Date Object
- Gets and displays current date or time.
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Arrays
- Holds multiple values in one variable.
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Timer
- Use setTimeout() to run something later.
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Objects
- Store data in key-value pairs, like {name:"Alex", age:10}.
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Interval
- Use setInterval() for animations or counters.
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If Statement
- Runs code only when a condition is true.
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Stop Timer
- Use clearInterval() to stop looping timers.
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