Within an Immediately Invoked Function Expression (IFFE), I am returning a Promise. The first thing that is logged is first, followed by third, and then second. Despite having the setTimeout inside the then block, shouldn't everything within it be executed synchronously?
(() => {
return new Promise(resolve => {
console.log("first")
resolve()
})
.then(() => {
setTimeout(() => console.log("second"), 3000)
})
})()
.then(() => console.log("third"))
To implement the use of setTimeout within a Promise, you need to create an additional promise and resolve it inside the setTimeout function. This is demonstrated in the code snippet below:
new Promise(resolve => setTimeout(resolve, 3000));
Here's how it looks in a larger context:
new Promise(resolve => {
console.log('first');
resolve();
})
.then(
() =>
new Promise(resolve =>
setTimeout(() => {
console.log('second');
resolve();
}, 3000)
)
)
.then(() => console.log('third'));
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