Quiz 30: Refresher: Promises

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Question 1

Shows '1 1'?

JavaScript

const idPromise = x => new Promise(resolve => resolve(x));
 
idPromise(1)
    .then(it => {
        document.writeln(it);
        return it;
    })
    .then(it => document.writeln(it));

Question 2

Shows '1 1'?

JavaScript

const idPromise = x => new Promise(resolve => resolve(x));
 
idPromise(1)
    .then(it => document.writeln(it))
    .then(it => document.writeln(it));

Question 3

Shows '1'?

JavaScript

const idPromise = x => new Promise(resolve => resolve(x));
 
idPromise(1)
    .then(it => document.writeln(it));

Question 4

Shows '1'?

JavaScript

const idPromise = x => new Promise(resolve => resolve(x));
 
document.writeln(idPromise(1));

Quiz 28 Quiz 34