Updated Jul 11 2020
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I mostly use commas to separate properties in an object, or array items.
However I never gave much attention the usage of it inside an expression.
Both expressions (in this case strings) are evaluated, and this returns the last element, the expression after the last comma. In this example it returns
You can assign the value to a variable, like this:
const letter = ('a', 'b') letter === 'b' //true