JavaScript Grouping Operator

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. This operator can only contain expressions. The parameter list is passed to a function within this operator which will treat it as an expression.

Syntax:

( )

This ( ) operator controls the precedence of evaluation in expressions

Example 1: Below is an example of the Grouping operator. 

Javascript

function gfg() {
    // 3 * (2 + 3)
    let value1 = 3 * (2 + 3);
    // (3 + 2) * 3
    let value2 = (3 + 2) * 3;
    console.log(value1);
    console.log(value2);
}
gfg();

Output

15
15

Example 2: Function as a statement and exception. In the below code, JavaScript considers a function as a statement if it is not preceded by any other statement. But applying a grouping operator that has the highest precedence over any other operator considers the function as an expression and hence it gets fully evaluated. 

JavaScript

function(x) { return x };
// SyntaxError: Function statements
// require a function name.


// function as expression
(function (x) { return x });
// This will run without any exception.

Output:

Uncaught SyntaxError: Function statements require a function name

Example 3: With and without grouping operator. 

Javascript

function gfg() {
    // 5 * 5 + 5
    // 25+5
    // 30
    let value = 5 * 5 + 5;
    console.log("Without grouping operator: " + value);

    // 5 * (5 + 5)
    // 5*10
    // 50
    let value1 = 5 * (5 + 5);
    console.log("With grouping operator: " + value1);
}
gfg();

Output

Without grouping operator: 30
With grouping operator: 50

We have a complete list of Javascript Operators, to check those please go through the Javascript Operators Complete Reference article.

Supported Browser:

• Chrome 1 and above
• Edge 12 and above
• Firefox 1 and above
• Internet Explorer 3 and above
• Opera 3 and above
• Safari 1 and above