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JavaScript: Scripting language
Web APIs: Programming interfaces
Structuring content with HTML module
Dynamic scripting with JavaScript module
The grouping operator consists of a pair of parentheses around an expression that groups the contents. The operator overrides the normal operator precedence, so that operators with lower precedence (as low as the comma o
An expression statement cannot start with the keyword function, because the parser would see it as the start of a function declaration. This means the following IIFE syntax is invalid:
An expression statement cannot start with the keyword function, because the parser would see it as the start of a function declaration. This means the following IIFE syntax is invalid:
Using the grouping operator to eliminate parsing ambiguity
An expression statement cannot start with the keyword function, because the parser would see it as the start of a function declaration. This means the following IIFE syntax is invalid:
Using the grouping operator to eliminate parsing ambiguity
An expression statement cannot start with the keyword function, because the parser would see it as the start of a function declaration. This means the following IIFE syntax is invalid:
Using the grouping operator to eliminate parsing ambiguity
An expression statement cannot start with the keyword function, because the parser would see it as the start of a function declaration. This means the following IIFE syntax is invalid:
Using the grouping operator to eliminate parsing ambiguity
An expression statement cannot start with the keyword function, because the parser would see it as the start of a function declaration. This means the following IIFE syntax is invalid:
The grouping operator can mitigate automatic semicolon insertion (ASI) pitfalls. For example, the return keyword and the returned expression cannot have a line break in between:
This page was last modified on May 22, 2026 by MDN contributors.