let x = (5, 6, 7, 8);
console.log(x);
let y = 5, 6, 7, 8;
console.log(y);In the example above, x will be assigned a value of 8, while the second line will result in an error. What is the reason behind the success of the first assignment? How does it qualify as valid JavaScript syntax?
The comma operator in JavaScript returns the last expression that is listed. It operates effectively when parenthesized and parsed as a single expression, as seen in the first case. However, once a valid expression concludes after an assignment operator (=), such as the value 1 in the second case, JavaScript expects another identifier to be declared next. This allows for the declaration of multiple variables using commas like so:
let x = 1, y = 2;
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