How to handle over variables in nested functions in JavaScript
When calling an function like in my case "setState(...)" which has a form where the first argument is a function, I wonder how to pass a local variable over to this function.
Here is my example:
let myDate = new Date();
this.setState((myDate) => {
return {
date: myDate
}
})
As you can see I'm using the arrow-notation here.
javascript ecmascript-6
edited Nov 12 at 14:59
Marcus Höglund
9,60852545
asked Nov 12 at 14:56
Marc M
5231623
add a comment |
When calling an function like in my case "setState(...)" which has a form where the first argument is a function, I wonder how to pass a local variable over to this function.
Here is my example:
let myDate = new Date();
this.setState((myDate) => {
return {
date: myDate
}
})
As you can see I'm using the arrow-notation here.
javascript ecmascript-6
edited Nov 12 at 14:59
Marcus Höglund
9,60852545
asked Nov 12 at 14:56
Marc M
5231623
add a comment |
When calling an function like in my case "setState(...)" which has a form where the first argument is a function, I wonder how to pass a local variable over to this function.
Here is my example:
let myDate = new Date();
this.setState((myDate) => {
return {
date: myDate
}
})
As you can see I'm using the arrow-notation here.
javascript ecmascript-6
edited Nov 12 at 14:59
Marcus Höglund
9,60852545
asked Nov 12 at 14:56
Marc M
5231623
When calling an function like in my case "setState(...)" which has a form where the first argument is a function, I wonder how to pass a local variable over to this function.
Here is my example:
let myDate = new Date();
this.setState((myDate) => {
return {
date: myDate
}
})
As you can see I'm using the arrow-notation here.
javascript ecmascript-6
javascript ecmascript-6
edited Nov 12 at 14:59
Marcus Höglund
9,60852545
asked Nov 12 at 14:56
Marc M
5231623
edited Nov 12 at 14:59
Marcus Höglund
9,60852545
asked Nov 12 at 14:56
Marc M
5231623
edited Nov 12 at 14:59
Marcus Höglund
9,60852545
edited Nov 12 at 14:59
Marcus Höglund
9,60852545
edited Nov 12 at 14:59
Marcus Höglund
9,60852545
9,60852545
asked Nov 12 at 14:56
Marc M
5231623
asked Nov 12 at 14:56
Marc M
5231623
asked Nov 12 at 14:56
Marc M
5231623
5231623
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
You have two variables called myDate.
- The one in the wider scope defined on line one
- The one local to the arrow function defined in its arguments on line three
The second one masks the first one.
Just don't do that so the function has access to the one in the wider scope.
this.setState(() => {
answered Nov 12 at 14:59
Quentin
638k718611031
add a comment |
Adding the parameter in your setState is unnecessary, simply call the variable in your setState and that will work.
let myDate = new Date();
this.setState(() => {
return {
date: myDate
}
})
answered Nov 12 at 15:02
Dmitriy
477112
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
You have two variables called myDate.
- The one in the wider scope defined on line one
- The one local to the arrow function defined in its arguments on line three
The second one masks the first one.
Just don't do that so the function has access to the one in the wider scope.
this.setState(() => {
answered Nov 12 at 14:59
Quentin
638k718611031
add a comment |
You have two variables called myDate.
- The one in the wider scope defined on line one
- The one local to the arrow function defined in its arguments on line three
The second one masks the first one.
Just don't do that so the function has access to the one in the wider scope.
this.setState(() => {
answered Nov 12 at 14:59
Quentin
638k718611031
add a comment |
You have two variables called myDate.
- The one in the wider scope defined on line one
- The one local to the arrow function defined in its arguments on line three
The second one masks the first one.
Just don't do that so the function has access to the one in the wider scope.
this.setState(() => {
answered Nov 12 at 14:59
Quentin
638k718611031
You have two variables called myDate.
- The one in the wider scope defined on line one
- The one local to the arrow function defined in its arguments on line three
The second one masks the first one.
Just don't do that so the function has access to the one in the wider scope.
this.setState(() => {
answered Nov 12 at 14:59
Quentin
638k718611031
answered Nov 12 at 14:59
Quentin
638k718611031
answered Nov 12 at 14:59
Quentin
638k718611031
answered Nov 12 at 14:59
Quentin
638k718611031
638k718611031
add a comment |
add a comment |
Adding the parameter in your setState is unnecessary, simply call the variable in your setState and that will work.
let myDate = new Date();
this.setState(() => {
return {
date: myDate
}
})
answered Nov 12 at 15:02
Dmitriy
477112
add a comment |
Adding the parameter in your setState is unnecessary, simply call the variable in your setState and that will work.
let myDate = new Date();
this.setState(() => {
return {
date: myDate
}
})
answered Nov 12 at 15:02
Dmitriy
477112
add a comment |
Adding the parameter in your setState is unnecessary, simply call the variable in your setState and that will work.
let myDate = new Date();
this.setState(() => {
return {
date: myDate
}
})
answered Nov 12 at 15:02
Dmitriy
477112
Adding the parameter in your setState is unnecessary, simply call the variable in your setState and that will work.
let myDate = new Date();
this.setState(() => {
return {
date: myDate
}
})
answered Nov 12 at 15:02
Dmitriy
477112
answered Nov 12 at 15:02
Dmitriy
477112
answered Nov 12 at 15:02
Dmitriy
477112
answered Nov 12 at 15:02
Dmitriy
477112
477112
add a comment |
add a comment |
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