Question

When is the comma operator useful in JavaScript?

Answer 1

The comma operator in JavaScript evaluates each of its operands. It returns the value of the last operand. Add multiple expressions using the comma operator.

The following is the syntax:

expression1,expression2, ……expression

Yes, you can use the comma operator to add multiple parameters in a for loop:

for (var a = 0, b =5; a <= 5; a++, b--)

You can also use the comma operator in a return statement. Process before returning using comma:

function myFunc() {

var a = 0;

return (a += 1,a);

}

Above you can see the value of a will process and then it will be returned.

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