JavaScript Comma Operator

February 8, 2021 10:45 am IST

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JavaScript Comma Operator

The comma operator evaluates each of its operands (from left to right) and returns the value of the last operand.

Example

HTML Online Editor

<!DOCTYPE html> <html> <body> <script> var a = (10, 20); document.write(a); </script> </body> </html>

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More Examples

In the following example, the comma operator saves the repetition of the keyword (var).

Example

HTML Online Editor

<!DOCTYPE html> <html> <body> <script> var a = 10, b = 20; document.write(a); </script> </body> </html>

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In the following example, the comma operator is used for concatenating a string and a variable.

Example

HTML Online Editor

<!DOCTYPE html> <html> <body> <script> var a = 10; document.write("The value of a : ", a); </script> </body> </html>

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In the following example, the comma operator is used to execute multiple functions when the condition in the conditional operator returns true.

Example

HTML Online Editor

<!DOCTYPE html> <html> <body> <p id="point"></p> <p id="point1"></p> <p id="point2"></p> <script> var x = document.getElementById("point"); var y = document.getElementById("point1"); var z = document.getElementById("point2"); function myF1(){ x.innerHTML = "Function 1 is executed"; } function myF2(){ y.innerHTML = "Function 2 is executed"; } function myF3(){ z.innerHTML = "Function 3 is executed"; } var result = (1 < 2) ? (myF1(), myF2()):myF3(); </script> </body> </html>

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