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Super simple trailing closure syntax in Swift
How do JavaScript closures work?What is the difference between a 'closure' and a 'lambda'?How can I remove a trailing newline in Python?JavaScript closure inside loops – simple practical exampleJavaScript closures vs. anonymous functions#pragma mark in Swift?Swift Beta performance: sorting arraysDont understand this Trailing ClosureSimple closure example with SwiftEquivalent of Swift trailing closure in C++
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I am trying to follow the example in the Swift docs for a trailing closure.
This is the function:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
print("we do something here and then go back")//does not print
And I call it here.
print("about to call function")//prints ok
someFunctionThatTakesAClosure(closure:
print("we did what was in the function and can now do something else")//does not print
)
print("after calling function")//prints ok
The function, however, is not getting called. What is wrong with the above?
Here's the Apple example:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
// Here's how you call this function without using a trailing closure:
someFunctionThatTakesAClosure(closure:
// closure's body goes here )
ios swift closures trailing
asked Mar 22 at 23:58
user6631314user6631314
626413
add a comment |
I am trying to follow the example in the Swift docs for a trailing closure.
This is the function:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
print("we do something here and then go back")//does not print
And I call it here.
print("about to call function")//prints ok
someFunctionThatTakesAClosure(closure:
print("we did what was in the function and can now do something else")//does not print
)
print("after calling function")//prints ok
The function, however, is not getting called. What is wrong with the above?
Here's the Apple example:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
// Here's how you call this function without using a trailing closure:
someFunctionThatTakesAClosure(closure:
// closure's body goes here )
ios swift closures trailing
asked Mar 22 at 23:58
user6631314user6631314
626413
A closure is just a value. Just like any other value, you can "ignore" its existence and nothing would happen. Making anything happen would require you to actually use the value.
– Alexander
Mar 23 at 0:27
add a comment |
I am trying to follow the example in the Swift docs for a trailing closure.
This is the function:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
print("we do something here and then go back")//does not print
And I call it here.
print("about to call function")//prints ok
someFunctionThatTakesAClosure(closure:
print("we did what was in the function and can now do something else")//does not print
)
print("after calling function")//prints ok
The function, however, is not getting called. What is wrong with the above?
Here's the Apple example:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
// Here's how you call this function without using a trailing closure:
someFunctionThatTakesAClosure(closure:
// closure's body goes here )
ios swift closures trailing
asked Mar 22 at 23:58
user6631314user6631314
626413
I am trying to follow the example in the Swift docs for a trailing closure.
This is the function:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
print("we do something here and then go back")//does not print
And I call it here.
print("about to call function")//prints ok
someFunctionThatTakesAClosure(closure:
print("we did what was in the function and can now do something else")//does not print
)
print("after calling function")//prints ok
The function, however, is not getting called. What is wrong with the above?
Here's the Apple example:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
// Here's how you call this function without using a trailing closure:
someFunctionThatTakesAClosure(closure:
// closure's body goes here )
ios swift closures trailing
ios swift closures trailing
asked Mar 22 at 23:58
user6631314user6631314
626413
asked Mar 22 at 23:58
user6631314user6631314
626413
asked Mar 22 at 23:58
user6631314user6631314
626413
asked Mar 22 at 23:58
user6631314user6631314
626413
asked Mar 22 at 23:58
user6631314user6631314
626413
626413
A closure is just a value. Just like any other value, you can "ignore" its existence and nothing would happen. Making anything happen would require you to actually use the value.
– Alexander
Mar 23 at 0:27
add a comment |
A closure is just a value. Just like any other value, you can "ignore" its existence and nothing would happen. Making anything happen would require you to actually use the value.
– Alexander
Mar 23 at 0:27
A closure is just a value. Just like any other value, you can "ignore" its existence and nothing would happen. Making anything happen would require you to actually use the value.
– Alexander
Mar 23 at 0:27
A closure is just a value. Just like any other value, you can "ignore" its existence and nothing would happen. Making anything happen would require you to actually use the value.
– Alexander
Mar 23 at 0:27
add a comment |
2 Answers
2
active
oldest
votes
Here is your example fixed:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
print("we do something here and then go back")
// don't forget to call the closure
closure()
print("about to call function")
// call the function using trailing closure syntax
someFunctionThatTakesAClosure()
print("we did what was in the function and can now do something else")
print("after calling function")
Output:
about to call function
we do something here and then go back
we did what was in the function and can now do something else
after calling function
answered Mar 23 at 0:19
vacawamavacawama
101k15179206
add a comment |
Docs isn't very clear in explanation you need
print("1")
someFunctionThatTakesAClosure() { // can be also someFunctionThatTakesAClosure without ()
print("3")
func someFunctionThatTakesAClosure(closure: () -> Void)
print("2")
/// do you job here and line blow will get you back
closure()
the trailing closure is meant for completions like when you do a network request and finally return the response like this
func someFunctionThatTakesAClosure(completion: @escaping ([String]) -> Void)
print("inside the function body")
Api.getData
completion(arr)
And to call
print("Before calling the function")
someFunctionThatTakesAClosure (arr) in
print("Inside the function callback / trailing closure " , arr)
print("After calling the function")
what you missed to read
answered Mar 23 at 0:09
Sh_KhanSh_Khan
49.6k51434
Thanks, I saw that but read it as though you could use either one. Thx for clarifying! I upvoted answer.
– user6631314
Mar 23 at 2:34
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Here is your example fixed:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
print("we do something here and then go back")
// don't forget to call the closure
closure()
print("about to call function")
// call the function using trailing closure syntax
someFunctionThatTakesAClosure()
print("we did what was in the function and can now do something else")
print("after calling function")
Output:
about to call function
we do something here and then go back
we did what was in the function and can now do something else
after calling function
answered Mar 23 at 0:19
vacawamavacawama
101k15179206
add a comment |
Here is your example fixed:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
print("we do something here and then go back")
// don't forget to call the closure
closure()
print("about to call function")
// call the function using trailing closure syntax
someFunctionThatTakesAClosure()
print("we did what was in the function and can now do something else")
print("after calling function")
Output:
about to call function
we do something here and then go back
we did what was in the function and can now do something else
after calling function
answered Mar 23 at 0:19
vacawamavacawama
101k15179206
add a comment |
Here is your example fixed:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
print("we do something here and then go back")
// don't forget to call the closure
closure()
print("about to call function")
// call the function using trailing closure syntax
someFunctionThatTakesAClosure()
print("we did what was in the function and can now do something else")
print("after calling function")
Output:
about to call function
we do something here and then go back
we did what was in the function and can now do something else
after calling function
answered Mar 23 at 0:19
vacawamavacawama
101k15179206
Here is your example fixed:
func someFunctionThatTakesAClosure(closure: () -> Void)
// function body goes here
print("we do something here and then go back")
// don't forget to call the closure
closure()
print("about to call function")
// call the function using trailing closure syntax
someFunctionThatTakesAClosure()
print("we did what was in the function and can now do something else")
print("after calling function")
Output:
about to call function
we do something here and then go back
we did what was in the function and can now do something else
after calling function
answered Mar 23 at 0:19
vacawamavacawama
101k15179206
answered Mar 23 at 0:19
vacawamavacawama
101k15179206
answered Mar 23 at 0:19
vacawamavacawama
101k15179206
answered Mar 23 at 0:19
vacawamavacawama
101k15179206
101k15179206
add a comment |
add a comment |
Docs isn't very clear in explanation you need
print("1")
someFunctionThatTakesAClosure() { // can be also someFunctionThatTakesAClosure without ()
print("3")
func someFunctionThatTakesAClosure(closure: () -> Void)
print("2")
/// do you job here and line blow will get you back
closure()
the trailing closure is meant for completions like when you do a network request and finally return the response like this
func someFunctionThatTakesAClosure(completion: @escaping ([String]) -> Void)
print("inside the function body")
Api.getData
completion(arr)
And to call
print("Before calling the function")
someFunctionThatTakesAClosure (arr) in
print("Inside the function callback / trailing closure " , arr)
print("After calling the function")
what you missed to read
answered Mar 23 at 0:09
Sh_KhanSh_Khan
49.6k51434
Thanks, I saw that but read it as though you could use either one. Thx for clarifying! I upvoted answer.
– user6631314
Mar 23 at 2:34
add a comment |
Docs isn't very clear in explanation you need
print("1")
someFunctionThatTakesAClosure() { // can be also someFunctionThatTakesAClosure without ()
print("3")
func someFunctionThatTakesAClosure(closure: () -> Void)
print("2")
/// do you job here and line blow will get you back
closure()
the trailing closure is meant for completions like when you do a network request and finally return the response like this
func someFunctionThatTakesAClosure(completion: @escaping ([String]) -> Void)
print("inside the function body")
Api.getData
completion(arr)
And to call
print("Before calling the function")
someFunctionThatTakesAClosure (arr) in
print("Inside the function callback / trailing closure " , arr)
print("After calling the function")
what you missed to read
answered Mar 23 at 0:09
Sh_KhanSh_Khan
49.6k51434
Thanks, I saw that but read it as though you could use either one. Thx for clarifying! I upvoted answer.
– user6631314
Mar 23 at 2:34
add a comment |
Docs isn't very clear in explanation you need
print("1")
someFunctionThatTakesAClosure() { // can be also someFunctionThatTakesAClosure without ()
print("3")
func someFunctionThatTakesAClosure(closure: () -> Void)
print("2")
/// do you job here and line blow will get you back
closure()
the trailing closure is meant for completions like when you do a network request and finally return the response like this
func someFunctionThatTakesAClosure(completion: @escaping ([String]) -> Void)
print("inside the function body")
Api.getData
completion(arr)
And to call
print("Before calling the function")
someFunctionThatTakesAClosure (arr) in
print("Inside the function callback / trailing closure " , arr)
print("After calling the function")
what you missed to read
answered Mar 23 at 0:09
Sh_KhanSh_Khan
49.6k51434
Docs isn't very clear in explanation you need
print("1")
someFunctionThatTakesAClosure() { // can be also someFunctionThatTakesAClosure without ()
print("3")
func someFunctionThatTakesAClosure(closure: () -> Void)
print("2")
/// do you job here and line blow will get you back
closure()
the trailing closure is meant for completions like when you do a network request and finally return the response like this
func someFunctionThatTakesAClosure(completion: @escaping ([String]) -> Void)
print("inside the function body")
Api.getData
completion(arr)
And to call
print("Before calling the function")
someFunctionThatTakesAClosure (arr) in
print("Inside the function callback / trailing closure " , arr)
print("After calling the function")
what you missed to read
answered Mar 23 at 0:09
Sh_KhanSh_Khan
49.6k51434
edited Mar 23 at 0:46
answered Mar 23 at 0:09
Sh_KhanSh_Khan
49.6k51434
answered Mar 23 at 0:09
Sh_KhanSh_Khan
49.6k51434
answered Mar 23 at 0:09
Sh_KhanSh_Khan
49.6k51434
49.6k51434
Thanks, I saw that but read it as though you could use either one. Thx for clarifying! I upvoted answer.
– user6631314
Mar 23 at 2:34
add a comment |
Thanks, I saw that but read it as though you could use either one. Thx for clarifying! I upvoted answer.
– user6631314
Mar 23 at 2:34
Thanks, I saw that but read it as though you could use either one. Thx for clarifying! I upvoted answer.
– user6631314
Mar 23 at 2:34
Thanks, I saw that but read it as though you could use either one. Thx for clarifying! I upvoted answer.
– user6631314
Mar 23 at 2:34
add a comment |
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A closure is just a value. Just like any other value, you can "ignore" its existence and nothing would happen. Making anything happen would require you to actually use the value.
– Alexander
Mar 23 at 0:27