What is this bracket sequence syntax called in JS?

Question

I really don't know what to google to find out the name for this syntax:

(1,2) seems to evaluate to 2

(1,2,3,"cake") seems to evaluate to "cake". etc

This is sometimes useful in anonymous functions in Array.reduce, where you need to perform a sequence of operations (say an increment) and also return the element on the right.

But where can I read about it and what's it called?

I'm not an expert but... Isn't just a good old [comma operator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comma_Operator)? — Álvaro González, Mar 28 '20 at 15:50

score 1 · Accepted Answer · answered Mar 28 '20 at 15:51

1

It's just the comma operator: it evaluates each of its operands (from left to right) and returns the value of the last operand.

answered Mar 28 '20 at 15:51

ZER0

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There are **lots** of duplicates for this question. – T.J. Crowder Mar 28 '20 at 15:52

What is this bracket sequence syntax called in JS?

1 Answers1