How can we not do anything if the suit falls into the fake?

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1

I want you to get the selectedGenre is different from empty or null he perform movie.genre === selectedGenre, but if it is null or empty just exit the function without returning anything.

selectedGenre ? movie.genre === selectedGenre :
javascript operators

  • Ternary operator should not be used as flow control.

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2 answers

3

Not making a ternary, this operator was created to give a result, if you do not want a result to be made the operator should not be used, clearly it is a case for a if.

But if I want to insist on it too much, what I reinforce is a mistake can result in null and void:

false ? console.log("ok") : null;

But there’s no way to make a function shut down without doing a bigger scam.

Correct and shorter form:

if (false) console.log("ok");

And using function to give output:

function teste(valor) {
    if (valor) console.log("ok");
    else return;
    console.log("continuou");
}
teste(false);

I put in the Github for future reference.

When you want to control the execution flow if is correct. Operators serve to generate results, not control flow.

2

In Javascript there is no type void, then the function, explicitly or not, will return something, if not specified, will be undefined:

function example() {}
console.log(example());

function example2() { return; }
console.log(example2());

const example3 = () => {};
console.log(example3());

Then you can return undefined in the third working of the ternary ("else"):

function example(bool) {
    return bool ? 'anything' : undefined;
}
console.log(example(true), example(false));

const example2 = (bool) => bool ? 'anything' : undefined;
console.log(example2(true), example2(false));

Another way to get the Undefined value is by using the operator void:

function example(bool) {
    return bool ? 'anything' : void 0;
}
console.log(example(true), example(false));

const example2 = (bool) => bool ? 'anything' : void 0;
console.log(example2(true), example2(false));

Still, I agree with the previous answer, the if is better for this purpose, however, in case of Arrow functions with a single line, in order to maintain simplicity, makes sense and is acceptable its use

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