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Where do function parameters come from in javascript?
How do JavaScript closures work?What is the most efficient way to deep clone an object in JavaScript?How do I remove a property from a JavaScript object?var functionName = function() vs function functionName() Which equals operator (== vs ===) should be used in JavaScript comparisons?Set a default parameter value for a JavaScript functionHow do I include a JavaScript file in another JavaScript file?What does “use strict” do in JavaScript, and what is the reasoning behind it?How to check whether a string contains a substring in JavaScript?How do I remove a particular element from an array in JavaScript?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
I am using the following code:
handleOwnerMode = ownerChecked =>
this.setState(prev => ( ownerChecked, showOwner: !prev.showOwner))
// this.setState(prev => ( ownerChecked: !prev.ownerChecked, showOwner: !prev.showOwner ))
Inside the render is
<Switch onChange=this.handleOwnerMode checked=this.state.ownerChecked />
OnChange, I somehow was able to receive what was changed about ownerChecked. Why is this the case? I didn't write onChange=this.handleOwnerMode(event.value) or anything like that...
Also, for setState. I normally just use this.setState( state: newState ), but now I can somehow pass in the previous state with this.setState( prev => ). Is there defined overloading somewhere that lets me do this?
Thank you.
javascript reactjs
asked Mar 26 at 12:19
FranktheTankFranktheTank
1216 bronze badges
add a comment |
I am using the following code:
handleOwnerMode = ownerChecked =>
this.setState(prev => ( ownerChecked, showOwner: !prev.showOwner))
// this.setState(prev => ( ownerChecked: !prev.ownerChecked, showOwner: !prev.showOwner ))
Inside the render is
<Switch onChange=this.handleOwnerMode checked=this.state.ownerChecked />
OnChange, I somehow was able to receive what was changed about ownerChecked. Why is this the case? I didn't write onChange=this.handleOwnerMode(event.value) or anything like that...
Also, for setState. I normally just use this.setState( state: newState ), but now I can somehow pass in the previous state with this.setState( prev => ). Is there defined overloading somewhere that lets me do this?
Thank you.
javascript reactjs
asked Mar 26 at 12:19
FranktheTankFranktheTank
1216 bronze badges
add a comment |
I am using the following code:
handleOwnerMode = ownerChecked =>
this.setState(prev => ( ownerChecked, showOwner: !prev.showOwner))
// this.setState(prev => ( ownerChecked: !prev.ownerChecked, showOwner: !prev.showOwner ))
Inside the render is
<Switch onChange=this.handleOwnerMode checked=this.state.ownerChecked />
OnChange, I somehow was able to receive what was changed about ownerChecked. Why is this the case? I didn't write onChange=this.handleOwnerMode(event.value) or anything like that...
Also, for setState. I normally just use this.setState( state: newState ), but now I can somehow pass in the previous state with this.setState( prev => ). Is there defined overloading somewhere that lets me do this?
Thank you.
javascript reactjs
asked Mar 26 at 12:19
FranktheTankFranktheTank
1216 bronze badges
I am using the following code:
handleOwnerMode = ownerChecked =>
this.setState(prev => ( ownerChecked, showOwner: !prev.showOwner))
// this.setState(prev => ( ownerChecked: !prev.ownerChecked, showOwner: !prev.showOwner ))
Inside the render is
<Switch onChange=this.handleOwnerMode checked=this.state.ownerChecked />
OnChange, I somehow was able to receive what was changed about ownerChecked. Why is this the case? I didn't write onChange=this.handleOwnerMode(event.value) or anything like that...
Also, for setState. I normally just use this.setState( state: newState ), but now I can somehow pass in the previous state with this.setState( prev => ). Is there defined overloading somewhere that lets me do this?
Thank you.
javascript reactjs
javascript reactjs
asked Mar 26 at 12:19
FranktheTankFranktheTank
1216 bronze badges
asked Mar 26 at 12:19
FranktheTankFranktheTank
1216 bronze badges
asked Mar 26 at 12:19
FranktheTankFranktheTank
1216 bronze badges
asked Mar 26 at 12:19
FranktheTankFranktheTank
1216 bronze badges
asked Mar 26 at 12:19
FranktheTankFranktheTank
1216 bronze badges
1216 bronze badges
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
OnChange, I somehow was able to receive what was changed about
ownerChecked. Why is this the case? I didn't write
onChange=this.handleOwnerMode(event.value) or anything like that...
In both cases you have passed a function (callback) to "receivers". First time to Switch Component, second time to React. Each of them can call your function/callback using any parameter they want. This is how normally callbacks are used.
Is there defined overloading somewhere that lets me do this?
Yeah probably setState checks if you passed a function to it and behaves differently: e.g. gives you previous state and calls your function. If you pass an object to it, it doesn't do that.
answered Mar 26 at 12:24
giorgi moniavagiorgi moniava
14.2k3 gold badges24 silver badges61 bronze badges
add a comment |
React events are synthetic so that even when yo do not pass any event parameters, function takes it. Take a look at these. More information 1, More information 2.
answered Mar 26 at 12:41
Yusuf AltıparmakYusuf Altıparmak
1148 bronze badges
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
OnChange, I somehow was able to receive what was changed about
ownerChecked. Why is this the case? I didn't write
onChange=this.handleOwnerMode(event.value) or anything like that...
In both cases you have passed a function (callback) to "receivers". First time to Switch Component, second time to React. Each of them can call your function/callback using any parameter they want. This is how normally callbacks are used.
Is there defined overloading somewhere that lets me do this?
Yeah probably setState checks if you passed a function to it and behaves differently: e.g. gives you previous state and calls your function. If you pass an object to it, it doesn't do that.
answered Mar 26 at 12:24
giorgi moniavagiorgi moniava
14.2k3 gold badges24 silver badges61 bronze badges
add a comment |
OnChange, I somehow was able to receive what was changed about
ownerChecked. Why is this the case? I didn't write
onChange=this.handleOwnerMode(event.value) or anything like that...
In both cases you have passed a function (callback) to "receivers". First time to Switch Component, second time to React. Each of them can call your function/callback using any parameter they want. This is how normally callbacks are used.
Is there defined overloading somewhere that lets me do this?
Yeah probably setState checks if you passed a function to it and behaves differently: e.g. gives you previous state and calls your function. If you pass an object to it, it doesn't do that.
answered Mar 26 at 12:24
giorgi moniavagiorgi moniava
14.2k3 gold badges24 silver badges61 bronze badges
add a comment |
OnChange, I somehow was able to receive what was changed about
ownerChecked. Why is this the case? I didn't write
onChange=this.handleOwnerMode(event.value) or anything like that...
In both cases you have passed a function (callback) to "receivers". First time to Switch Component, second time to React. Each of them can call your function/callback using any parameter they want. This is how normally callbacks are used.
Is there defined overloading somewhere that lets me do this?
Yeah probably setState checks if you passed a function to it and behaves differently: e.g. gives you previous state and calls your function. If you pass an object to it, it doesn't do that.
answered Mar 26 at 12:24
giorgi moniavagiorgi moniava
14.2k3 gold badges24 silver badges61 bronze badges
OnChange, I somehow was able to receive what was changed about
ownerChecked. Why is this the case? I didn't write
onChange=this.handleOwnerMode(event.value) or anything like that...
In both cases you have passed a function (callback) to "receivers". First time to Switch Component, second time to React. Each of them can call your function/callback using any parameter they want. This is how normally callbacks are used.
Is there defined overloading somewhere that lets me do this?
Yeah probably setState checks if you passed a function to it and behaves differently: e.g. gives you previous state and calls your function. If you pass an object to it, it doesn't do that.
answered Mar 26 at 12:24
giorgi moniavagiorgi moniava
14.2k3 gold badges24 silver badges61 bronze badges
answered Mar 26 at 12:24
giorgi moniavagiorgi moniava
14.2k3 gold badges24 silver badges61 bronze badges
answered Mar 26 at 12:24
giorgi moniavagiorgi moniava
14.2k3 gold badges24 silver badges61 bronze badges
answered Mar 26 at 12:24
giorgi moniavagiorgi moniava
14.2k3 gold badges24 silver badges61 bronze badges
14.2k3 gold badges24 silver badges61 bronze badges
add a comment |
add a comment |
React events are synthetic so that even when yo do not pass any event parameters, function takes it. Take a look at these. More information 1, More information 2.
answered Mar 26 at 12:41
Yusuf AltıparmakYusuf Altıparmak
1148 bronze badges
add a comment |
React events are synthetic so that even when yo do not pass any event parameters, function takes it. Take a look at these. More information 1, More information 2.
answered Mar 26 at 12:41
Yusuf AltıparmakYusuf Altıparmak
1148 bronze badges
add a comment |
React events are synthetic so that even when yo do not pass any event parameters, function takes it. Take a look at these. More information 1, More information 2.
answered Mar 26 at 12:41
Yusuf AltıparmakYusuf Altıparmak
1148 bronze badges
React events are synthetic so that even when yo do not pass any event parameters, function takes it. Take a look at these. More information 1, More information 2.
answered Mar 26 at 12:41
Yusuf AltıparmakYusuf Altıparmak
1148 bronze badges
answered Mar 26 at 12:41
Yusuf AltıparmakYusuf Altıparmak
1148 bronze badges
answered Mar 26 at 12:41
Yusuf AltıparmakYusuf Altıparmak
1148 bronze badges
answered Mar 26 at 12:41
Yusuf AltıparmakYusuf Altıparmak
1148 bronze badges
1148 bronze badges
add a comment |
add a comment |
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