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Are these 2 JavaScript statements equivalent?

These 2 statements seem to do the same thing.

const handleClick = () => alert('foo');

and

function handleClick() {
    alert('foo');
}

Are they identical and just syntactically different? The first one looks like a variable declaration, whereas the second one is clearly a function definition.

7 months ago · Juan Pablo Isaza

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Answer 1 · 2022-07-11T10:02:48.357Z

No, they are not the same thing. The arrow function has some limitations:

Does not have its own bindings to this or super, and should not be used as methods.
Does not have new.target keyword.
Not suitable for call, apply and bind methods, which generally rely on establishing a scope.
Can not be used as constructors.
Can not use yield, within its body.

Answer 2 · 2022-07-11T10:02:48.364Z

ES6 arrow functions provide you with an alternative way to write a shorter syntax compared to the function expression. There is no performance difference.

Are arrow functions faster (more performant, lighter) than ordinary standalone function declaration in v8?