Web Reference: Jul 8, 2025 · You can use the comma operator when you want to include multiple expressions in a location that requires a single expression. The most common usage of this operator is to supply multiple updaters in a for loop. The comma operator evaluates all expressions but returns only the last one. So [1,2,3,4] becomes 4. The code effectively runs: [3,4,5,6,7] [4] → 7. Mar 6, 2012 · Using the comma operator, we can push onto the array, specify the array as the last operand to comma, and then use the result -- the array itself -- for a subsequent array method call, a sort of chaining:
YouTube Excerpt: This episode talks about return values from expressions and variable assignments as well as the use of the
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