How can i synchronize these 3 promise returning functions (For example in other function)? I want to get following output -> Start -> (2secs)..2..(3secs)..3..(4secs)..4 -> End. I've tryed Generators, but my output wasn't like that (Probably i did something wrong)
function resolveAfter2Seconds() {
new Promise(resolve => {
setTimeout(() => {
resolve('resolved 2');
console.log('2')
}, 2000);
});
}
function resolveAfter3Seconds() {
new Promise(resolve => {
setTimeout(() => {
resolve('resolved 2');
console.log('3')
}, 3000);
});
}
function resolveAfter4Seconds() {
new Promise(resolve => {
setTimeout(() => {
resolve('resolved 2');
console.log('4')
}, 4000);
});
}
First, change the functions to return their promises. For example:
function resolveAfter2Seconds() {
return new Promise(resolve => { // <------ added return statement
setTimeout(() => {
resolve('resolved 2');
console.log('2')
}, 2000);
});
}
Then either chain the promises together
resolveAfter2Seconds()
.then(() => resolveAfter3Seconds())
.then(() => resolveAfter4Seconds());
Or use async/await syntax:
async function exampleFunction() {
await resolveAfter2Seconds();
await resolveAfter3Seconds();
await resolveAfter4Seconds();
}
You might want to try chaining to get the sequential output:
resolveAfter2Seconds()
.then(() => resolveAfter3Seconds())
.then(() => resolveAfter4Seconds())
PS. Don't forget to make those functions return promises.
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