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Operator precedence and associativity are fundamental concepts in JavaScript that dictate the order in which operators are evaluated in expressions. Precedence determines which operators are evaluated first, while associativity defines the order of evaluation when operators have the same precedence.

In JavaScript, operators with higher precedence are evaluated before operators with lower precedence. For example, multiplication (`*`) has a higher precedence than addition (`+`), so `2 + 3 * 4` is evaluated as `2 + (3 * 4)`.

If operators have the same precedence, their associativity determines the order of evaluation. Associativity can be left-to-right or right-to-left. For example, addition (`+`) and subtraction (`-`) have the same precedence and left-to-right associativity, so `2 + 3 - 4` is evaluated as `(2 + 3) - 4`.

It's crucial to understand operator precedence and associativity to predict how expressions will be evaluated accurately. Using parentheses can override the default precedence and associativity, ensuring the desired order of evaluation.

By mastering operator precedence and associativity, developers can write more predictable and maintainable JavaScript code, avoiding common pitfalls and errors.

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