CODEWITHSUNDEEP
javascriptconditional-operatornot-operator
João Gabriel Onofre
João Gabriel Onofre

Reputation: 47

How does the conditional operator work with a negation?

I'm beginning to learn asynchronous javascript and, while I did understand callbacks and promises, something about the code I was learning got my attention. For example:

function funcA(){
    console.log('World')
}

function funcB() {
    return new Promise((resolve, reject) => {
        console.log('Hello')

        const error = false
        !error ? resolve() : reject('Error')
    })
}

funcB()
.then(funcA)
.catch(err => console.log(err))

In this case, isn't the !error saying if(error === true) then resolve it, and else (error === false), reject()?

Or it is simple saying "if there is no error, than resolve"?

Upvotes: 0

Views: 313

Answers (1)

FrostyZombi3
FrostyZombi3

Reputation: 629

In the example code you provided, the line !error ? resolve() : reject('Error') would read "if not error, resolve, else reject with message 'Error'".

It is import to note the not operator(!) at the start of the line. This would be the equivalent to the following:

const error = false
if (!error) {
    resolve()
} else {
    reject('Error')
}

Upvotes: 0

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