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When you call a function, the inputs you provide are arguments.
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Runs a block only when the test inside () is true.
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Determines which parts of code can see a variable.
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Runs when the if condition is false.
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Declared outside functions and visible to all code.
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Runs right away: (function(){ console.log("Run!") })();
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Always returns same result with same input.
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Things like clicks, key presses, or mouse moves trigger events.
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Use addEventListener("click", myFunction) to run code on click.