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The grouping operator ( ) controls the precedence of evaluation in expressions.

Syntax

 ( )

Description

The grouping operator consists of a pair of parentheses around an expression or sub-expression to override the normal operator precedence so that expressions with lower precedence can be evaluated before an expression with higher priority. As it sounds it groups what's inside of the parentheses.

Examples

Overriding multiplication and division first, then addition and subtraction to evaluate addition first.

var a = 1;
var b = 2;
var c = 3;

// default precedence
a + b * c     // 7
// evaluated by default like this
a + (b * c)   // 7

// now overriding precedence 
// addition before multiplication   
(a + b) * c   // 9

// which is equivalent to
a * c + b * c // 9

Specifications

Specification Status Comment
ECMAScript Latest Draft (ECMA-262)
The definition of 'The Grouping Operator' in that specification.
Draft  
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'The Grouping Operator' in that specification.
Standard  
ECMAScript 5.1 (ECMA-262)
The definition of 'The Grouping Operator' in that specification.
Standard  
ECMAScript 1st Edition (ECMA-262)
The definition of 'The Grouping Operator' in that specification.
Standard Initial definition. Implemented in JavaScript 1.0.

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic supportChrome Full support YesEdge Full support YesFirefox Full support 1IE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yesnodejs Full support Yes

Legend

Full support  
Full support

See also

Document Tags and Contributors

المساهمون في هذه الصفحة: sambgordon, wbamberg, fscholz, ___, jameshkramer, cPhost, Sebastianz, JayTaves
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