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Showing content from https://webplatform.github.io/docs/javascript/operators/comma below:

comma · WebPlatform Docs

comma Summary

The comma operator (,) causes two expressions to be executed sequentially.

Syntax

expression1 , expression2

expression1: Any expression.
expression2: Any expression.

Examples

The , operator causes the expressions to be executed in left-to-right order. A common use for the , operator is in the increment expression of a for loop. For example, the for statement allows only a single expression to be executed at the end of every pass through a loop. The , operator allows multiple expressions to be treated as a single expression, so both variables can be incremented.

j=25;
for (i = 0; i < 10; i++, j++)
{
    k = i + j;
}