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()Edit

Parentheses (or "round brackets") explicitly set the limits of an expression and thereby clarify operator precedence.

x = 5 * (3 + 7);

x is 50.

x = 5 * 3 + 7;

x is 22.

They have a special use related to functions.

{}Edit

Braces (or "curly brackets") form a block. If treated as an expression, they become an object literal instead. Also, the block is a mandatory part of each function literal.

[]Edit

Square brackets are used exclusively with arrays.

;Edit

The semicolon tells the parser that the previous statement is finished. In most cases, it is unnecessary; see control structures.

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