What is the syntax for Function.prototype.call or Function.prototype.apply with an async function
up vote
-1
down vote
favorite
What is the syntax for using the call() or apply() methods to change this when dealing async functions?
So by way of example:
class Foo {
async someLongMethod(){
... Do stuff
}
}
class Bar {
async someOtherMethodThatWillWait(){
//Will the following work?
await Foo.prototype.someLongMethod.call(this);
}
}
javascript async-await
asked Nov 22 at 8:14
Tom Maher
6771126
|
show 2 more comments
up vote
-1
down vote
favorite
What is the syntax for using the call() or apply() methods to change this when dealing async functions?
So by way of example:
class Foo {
async someLongMethod(){
... Do stuff
}
}
class Bar {
async someOtherMethodThatWillWait(){
//Will the following work?
await Foo.prototype.someLongMethod.call(this);
}
}
javascript async-await
asked Nov 22 at 8:14
Tom Maher
6771126
2
Will the following workWhy not just try it? It looks OK to me
– CertainPerformance
Nov 22 at 8:15
1
awaitacts on promises, so as that method returns a promise you're fine. It's certainly syntactically valid.
– jonrsharpe
Nov 22 at 8:16
@jonrsharpe Since it's anasyncfunction, it will necessarily return aPromise
– CertainPerformance
Nov 22 at 8:16
@CertainPerformance ah, hadn't spotted that it was also in the example, thanks!
– jonrsharpe
Nov 22 at 8:17
1
No, Promises in any form are not synchronous (except when calling the constructor, initially)
– CertainPerformance
Nov 22 at 8:33
|
show 2 more comments
up vote
-1
down vote
favorite
up vote
-1
down vote
favorite
What is the syntax for using the call() or apply() methods to change this when dealing async functions?
So by way of example:
class Foo {
async someLongMethod(){
... Do stuff
}
}
class Bar {
async someOtherMethodThatWillWait(){
//Will the following work?
await Foo.prototype.someLongMethod.call(this);
}
}
javascript async-await
asked Nov 22 at 8:14
Tom Maher
6771126
What is the syntax for using the call() or apply() methods to change this when dealing async functions?
So by way of example:
class Foo {
async someLongMethod(){
... Do stuff
}
}
class Bar {
async someOtherMethodThatWillWait(){
//Will the following work?
await Foo.prototype.someLongMethod.call(this);
}
}
javascript async-await
javascript async-await
asked Nov 22 at 8:14
Tom Maher
6771126
asked Nov 22 at 8:14
Tom Maher
6771126
asked Nov 22 at 8:14
Tom Maher
6771126
asked Nov 22 at 8:14
Tom Maher
6771126
asked Nov 22 at 8:14
Tom Maher
6771126
6771126
2
Will the following workWhy not just try it? It looks OK to me
– CertainPerformance
Nov 22 at 8:15
1
awaitacts on promises, so as that method returns a promise you're fine. It's certainly syntactically valid.
– jonrsharpe
Nov 22 at 8:16
@jonrsharpe Since it's anasyncfunction, it will necessarily return aPromise
– CertainPerformance
Nov 22 at 8:16
@CertainPerformance ah, hadn't spotted that it was also in the example, thanks!
– jonrsharpe
Nov 22 at 8:17
1
No, Promises in any form are not synchronous (except when calling the constructor, initially)
– CertainPerformance
Nov 22 at 8:33
|
show 2 more comments
2
Will the following workWhy not just try it? It looks OK to me
– CertainPerformance
Nov 22 at 8:15
1
awaitacts on promises, so as that method returns a promise you're fine. It's certainly syntactically valid.
– jonrsharpe
Nov 22 at 8:16
@jonrsharpe Since it's anasyncfunction, it will necessarily return aPromise
– CertainPerformance
Nov 22 at 8:16
@CertainPerformance ah, hadn't spotted that it was also in the example, thanks!
– jonrsharpe
Nov 22 at 8:17
1
No, Promises in any form are not synchronous (except when calling the constructor, initially)
– CertainPerformance
Nov 22 at 8:33
2
2
Will the following work Why not just try it? It looks OK to me– CertainPerformance
Nov 22 at 8:15
Will the following work Why not just try it? It looks OK to me– CertainPerformance
Nov 22 at 8:15
1
1
await acts on promises, so as that method returns a promise you're fine. It's certainly syntactically valid.– jonrsharpe
Nov 22 at 8:16
await acts on promises, so as that method returns a promise you're fine. It's certainly syntactically valid.– jonrsharpe
Nov 22 at 8:16
@jonrsharpe Since it's an
async function, it will necessarily return a Promise– CertainPerformance
Nov 22 at 8:16
@jonrsharpe Since it's an
async function, it will necessarily return a Promise– CertainPerformance
Nov 22 at 8:16
@CertainPerformance ah, hadn't spotted that it was also in the example, thanks!
– jonrsharpe
Nov 22 at 8:17
@CertainPerformance ah, hadn't spotted that it was also in the example, thanks!
– jonrsharpe
Nov 22 at 8:17
1
1
No, Promises in any form are not synchronous (except when calling the constructor, initially)
– CertainPerformance
Nov 22 at 8:33
No, Promises in any form are not synchronous (except when calling the constructor, initially)
– CertainPerformance
Nov 22 at 8:33
|
show 2 more comments
1 Answer
1
active
oldest
votes
up vote
2
down vote
accepted
It's exactly the same as the syntax for calling normal functions, there is no difference. You cannot really distinguish an async function from any other function that returns a promise.
answered Nov 22 at 9:07
Bergi
359k55533850
I managed to test the call within protractor through node using a browser wait and it does indeed work. Thanks for everyone's input.
– Tom Maher
Nov 22 at 10:09
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
accepted
It's exactly the same as the syntax for calling normal functions, there is no difference. You cannot really distinguish an async function from any other function that returns a promise.
answered Nov 22 at 9:07
Bergi
359k55533850
I managed to test the call within protractor through node using a browser wait and it does indeed work. Thanks for everyone's input.
– Tom Maher
Nov 22 at 10:09
add a comment |
up vote
2
down vote
accepted
It's exactly the same as the syntax for calling normal functions, there is no difference. You cannot really distinguish an async function from any other function that returns a promise.
answered Nov 22 at 9:07
Bergi
359k55533850
I managed to test the call within protractor through node using a browser wait and it does indeed work. Thanks for everyone's input.
– Tom Maher
Nov 22 at 10:09
add a comment |
up vote
2
down vote
accepted
up vote
2
down vote
accepted
It's exactly the same as the syntax for calling normal functions, there is no difference. You cannot really distinguish an async function from any other function that returns a promise.
answered Nov 22 at 9:07
Bergi
359k55533850
It's exactly the same as the syntax for calling normal functions, there is no difference. You cannot really distinguish an async function from any other function that returns a promise.
answered Nov 22 at 9:07
Bergi
359k55533850
answered Nov 22 at 9:07
Bergi
359k55533850
answered Nov 22 at 9:07
Bergi
359k55533850
answered Nov 22 at 9:07
Bergi
359k55533850
359k55533850
I managed to test the call within protractor through node using a browser wait and it does indeed work. Thanks for everyone's input.
– Tom Maher
Nov 22 at 10:09
add a comment |
I managed to test the call within protractor through node using a browser wait and it does indeed work. Thanks for everyone's input.
– Tom Maher
Nov 22 at 10:09
I managed to test the call within protractor through node using a browser wait and it does indeed work. Thanks for everyone's input.
– Tom Maher
Nov 22 at 10:09
I managed to test the call within protractor through node using a browser wait and it does indeed work. Thanks for everyone's input.
– Tom Maher
Nov 22 at 10:09
add a comment |
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2
Will the following workWhy not just try it? It looks OK to me– CertainPerformance
Nov 22 at 8:15
1
awaitacts on promises, so as that method returns a promise you're fine. It's certainly syntactically valid.– jonrsharpe
Nov 22 at 8:16
@jonrsharpe Since it's an
asyncfunction, it will necessarily return aPromise– CertainPerformance
Nov 22 at 8:16
@CertainPerformance ah, hadn't spotted that it was also in the example, thanks!
– jonrsharpe
Nov 22 at 8:17
1
No, Promises in any form are not synchronous (except when calling the constructor, initially)
– CertainPerformance
Nov 22 at 8:33