Yes, but if I am ok with stopping the world, why doesn't JS allow me to do so? Why do we need to have an entirely seperate api for sync http calls when allowing awaiting inside sync functions would have done the same thing?
¹Not really, but close enough.
Originally, this was resolved via callbacks:
doSomething((err, result) => {
if (err) { ...failure code... }
...success code...
}
doSomething().then((result) => {
...success code...
}).catch((err) => {
...failure code...
});
try {
let result = await doSomething();
...success code...
}
catch (err) {
...failure code...
}
function syncFn() {
let result
let state = 'pending'
asyncFn()
.then(data => {
result = data
state = 'fulfilled'
})
.catch(error => {
result = error
state = 'rejected'
})
while(state==='pending') {} // Stop the world
return result
}
console.log('Result', syncFn()) function delayedValue(val, ms) {
return new Promise(resolve => setTimeout(() => resolve(val), ms))
}
function syncFn() {
let result
let state = 'pending'
delayedValue(1234, 500)
.then(data => {
result = data
state = 'fulfilled'
})
.catch(error => {
result = error
state = 'rejected'
})
while (state == 'pending') {}
return result
}
console.log('before')
console.log(syncFn())
console.log('after')> async function run() {
// call your program logic here
await myCode()
> run()
function A(){ B()}
function B(){ C()}
...
function Y(){ await? Z()}
async function Z(){...}