How to refer to outer this on forEach in Kotlin
I have the following case
someThing.forEach{
someWidget.setOnClickListener{
//it is an View
//I need foreach it of someObject
}
}
I read this answer but it does not work
kotlin how to refer outer-scope this in multi-layer apply functions
android lambda kotlin asked Nov 13 '18 at 16:33
Erick Daniel Juarez GilErick Daniel Juarez Gil
104
add a comment |
I have the following case
someThing.forEach{
someWidget.setOnClickListener{
//it is an View
//I need foreach it of someObject
}
}
I read this answer but it does not work
kotlin how to refer outer-scope this in multi-layer apply functions
android lambda kotlin asked Nov 13 '18 at 16:33
Erick Daniel Juarez GilErick Daniel Juarez Gil
104
add a comment |
I have the following case
someThing.forEach{
someWidget.setOnClickListener{
//it is an View
//I need foreach it of someObject
}
}
I read this answer but it does not work
kotlin how to refer outer-scope this in multi-layer apply functions
android lambda kotlin asked Nov 13 '18 at 16:33
Erick Daniel Juarez GilErick Daniel Juarez Gil
104
I have the following case
someThing.forEach{
someWidget.setOnClickListener{
//it is an View
//I need foreach it of someObject
}
}
I read this answer but it does not work
kotlin how to refer outer-scope this in multi-layer apply functions
android lambda kotlin android lambda kotlin asked Nov 13 '18 at 16:33
Erick Daniel Juarez GilErick Daniel Juarez Gil
104
asked Nov 13 '18 at 16:33
Erick Daniel Juarez GilErick Daniel Juarez Gil
104
asked Nov 13 '18 at 16:33
Erick Daniel Juarez GilErick Daniel Juarez Gil
104
asked Nov 13 '18 at 16:33
Erick Daniel Juarez GilErick Daniel Juarez Gil
104
asked Nov 13 '18 at 16:33
Erick Daniel Juarez GilErick Daniel Juarez Gil
104
104
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
The problem is that you are not dealing with this here.
forEach has a parameter and for simplicity you can leave it away and just use it instead. Not using it is the same as using _ -> instead... you just discard it.
So your example written with named lambda parameters instead:
someThing.forEach{ some -> // 'it' was available here too, but will not be accessible from within the next setOnClickListener...
someWidget.setOnClickListener{
// some contains one of the someThings now and 'it' is still your View
}
}
answered Nov 13 '18 at 16:44
RolandRoland
9,61911141
add a comment |
You can name the variable in the forEach.
things.forEach { thing ->
someWidget.setOnClickListener {
thing.doSomething()
}
}
answered Nov 13 '18 at 16:42
CristanCristan
2,9432630
add a comment |
I think you mean something like this:
someThing.forEach{ x->
someWidget.setOnClickListener{
//use x
//I need foreach it of someObject
}
}
just use another name like x, you don't have to use it.
Here is an example:
val a = mutableListOf<Int>(1, 3)
val b = mutableListOf<Int>(2, 4)
a.forEach { x ->
b.forEach {
println("" + x + " " + it)
}
}
here x is each item from list a
and it is each item from list b
answered Nov 13 '18 at 16:43
forpasforpas
10.4k1421
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
The problem is that you are not dealing with this here.
forEach has a parameter and for simplicity you can leave it away and just use it instead. Not using it is the same as using _ -> instead... you just discard it.
So your example written with named lambda parameters instead:
someThing.forEach{ some -> // 'it' was available here too, but will not be accessible from within the next setOnClickListener...
someWidget.setOnClickListener{
// some contains one of the someThings now and 'it' is still your View
}
}
answered Nov 13 '18 at 16:44
RolandRoland
9,61911141
add a comment |
The problem is that you are not dealing with this here.
forEach has a parameter and for simplicity you can leave it away and just use it instead. Not using it is the same as using _ -> instead... you just discard it.
So your example written with named lambda parameters instead:
someThing.forEach{ some -> // 'it' was available here too, but will not be accessible from within the next setOnClickListener...
someWidget.setOnClickListener{
// some contains one of the someThings now and 'it' is still your View
}
}
answered Nov 13 '18 at 16:44
RolandRoland
9,61911141
add a comment |
The problem is that you are not dealing with this here.
forEach has a parameter and for simplicity you can leave it away and just use it instead. Not using it is the same as using _ -> instead... you just discard it.
So your example written with named lambda parameters instead:
someThing.forEach{ some -> // 'it' was available here too, but will not be accessible from within the next setOnClickListener...
someWidget.setOnClickListener{
// some contains one of the someThings now and 'it' is still your View
}
}
answered Nov 13 '18 at 16:44
RolandRoland
9,61911141
The problem is that you are not dealing with this here.
forEach has a parameter and for simplicity you can leave it away and just use it instead. Not using it is the same as using _ -> instead... you just discard it.
So your example written with named lambda parameters instead:
someThing.forEach{ some -> // 'it' was available here too, but will not be accessible from within the next setOnClickListener...
someWidget.setOnClickListener{
// some contains one of the someThings now and 'it' is still your View
}
}
answered Nov 13 '18 at 16:44
RolandRoland
9,61911141
answered Nov 13 '18 at 16:44
RolandRoland
9,61911141
answered Nov 13 '18 at 16:44
RolandRoland
9,61911141
answered Nov 13 '18 at 16:44
RolandRoland
9,61911141
9,61911141
add a comment |
add a comment |
You can name the variable in the forEach.
things.forEach { thing ->
someWidget.setOnClickListener {
thing.doSomething()
}
}
answered Nov 13 '18 at 16:42
CristanCristan
2,9432630
add a comment |
You can name the variable in the forEach.
things.forEach { thing ->
someWidget.setOnClickListener {
thing.doSomething()
}
}
answered Nov 13 '18 at 16:42
CristanCristan
2,9432630
add a comment |
You can name the variable in the forEach.
things.forEach { thing ->
someWidget.setOnClickListener {
thing.doSomething()
}
}
answered Nov 13 '18 at 16:42
CristanCristan
2,9432630
You can name the variable in the forEach.
things.forEach { thing ->
someWidget.setOnClickListener {
thing.doSomething()
}
}
answered Nov 13 '18 at 16:42
CristanCristan
2,9432630
answered Nov 13 '18 at 16:42
CristanCristan
2,9432630
answered Nov 13 '18 at 16:42
CristanCristan
2,9432630
answered Nov 13 '18 at 16:42
CristanCristan
2,9432630
2,9432630
add a comment |
add a comment |
I think you mean something like this:
someThing.forEach{ x->
someWidget.setOnClickListener{
//use x
//I need foreach it of someObject
}
}
just use another name like x, you don't have to use it.
Here is an example:
val a = mutableListOf<Int>(1, 3)
val b = mutableListOf<Int>(2, 4)
a.forEach { x ->
b.forEach {
println("" + x + " " + it)
}
}
here x is each item from list a
and it is each item from list b
answered Nov 13 '18 at 16:43
forpasforpas
10.4k1421
add a comment |
I think you mean something like this:
someThing.forEach{ x->
someWidget.setOnClickListener{
//use x
//I need foreach it of someObject
}
}
just use another name like x, you don't have to use it.
Here is an example:
val a = mutableListOf<Int>(1, 3)
val b = mutableListOf<Int>(2, 4)
a.forEach { x ->
b.forEach {
println("" + x + " " + it)
}
}
here x is each item from list a
and it is each item from list b
answered Nov 13 '18 at 16:43
forpasforpas
10.4k1421
add a comment |
I think you mean something like this:
someThing.forEach{ x->
someWidget.setOnClickListener{
//use x
//I need foreach it of someObject
}
}
just use another name like x, you don't have to use it.
Here is an example:
val a = mutableListOf<Int>(1, 3)
val b = mutableListOf<Int>(2, 4)
a.forEach { x ->
b.forEach {
println("" + x + " " + it)
}
}
here x is each item from list a
and it is each item from list b
answered Nov 13 '18 at 16:43
forpasforpas
10.4k1421
I think you mean something like this:
someThing.forEach{ x->
someWidget.setOnClickListener{
//use x
//I need foreach it of someObject
}
}
just use another name like x, you don't have to use it.
Here is an example:
val a = mutableListOf<Int>(1, 3)
val b = mutableListOf<Int>(2, 4)
a.forEach { x ->
b.forEach {
println("" + x + " " + it)
}
}
here x is each item from list a
and it is each item from list b
answered Nov 13 '18 at 16:43
forpasforpas
10.4k1421
edited Nov 13 '18 at 16:48
answered Nov 13 '18 at 16:43
forpasforpas
10.4k1421
answered Nov 13 '18 at 16:43
forpasforpas
10.4k1421
answered Nov 13 '18 at 16:43
forpasforpas
10.4k1421
10.4k1421
add a comment |
add a comment |
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