How to read React.Children.map api notation?











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Looking at the code for React.Children.map, it looks like the function takes up to 3 args.



The api doc for React.Children.map shows



React.Children.map(children, function[(thisArg)])



If it can take 3 args I expected to see 2 commas in there somewhere.



My question is



How do you read React.Children.map(children, function[(thisArg)]) in plain english?



So far I have "React.Children.map is a function that..."










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    up vote
    0
    down vote

    favorite












    Looking at the code for React.Children.map, it looks like the function takes up to 3 args.



    The api doc for React.Children.map shows



    React.Children.map(children, function[(thisArg)])



    If it can take 3 args I expected to see 2 commas in there somewhere.



    My question is



    How do you read React.Children.map(children, function[(thisArg)]) in plain english?



    So far I have "React.Children.map is a function that..."










    share|improve this question


























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      Looking at the code for React.Children.map, it looks like the function takes up to 3 args.



      The api doc for React.Children.map shows



      React.Children.map(children, function[(thisArg)])



      If it can take 3 args I expected to see 2 commas in there somewhere.



      My question is



      How do you read React.Children.map(children, function[(thisArg)]) in plain english?



      So far I have "React.Children.map is a function that..."










      share|improve this question















      Looking at the code for React.Children.map, it looks like the function takes up to 3 args.



      The api doc for React.Children.map shows



      React.Children.map(children, function[(thisArg)])



      If it can take 3 args I expected to see 2 commas in there somewhere.



      My question is



      How do you read React.Children.map(children, function[(thisArg)]) in plain english?



      So far I have "React.Children.map is a function that..."







      reactjs






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 17 at 16:59

























      asked Nov 10 at 19:00









      psalaets

      58226




      58226
























          1 Answer
          1






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          accepted










          function[(thisArg)] isn't a standard denotation. As the documentation states, map




          Invokes a function on every immediate child contained within children with this set to thisArg.




          Children.map signature is similar to JavaScript Array.prototype.map. There are 3 arguments, 3rd argument is optional this context for callback function if needed.



          Children.map is documented better in source code:



          /**
          * Maps children that are typically specified as `props.children`.
          *
          * See https://reactjs.org/docs/react-api.html#reactchildrenmap
          *
          * The provided mapFunction(child, key, index) will be called for each
          * leaf child.
          *
          * @param {?*} children Children tree container.
          * @param {function(*, int)} func The map function.
          * @param {*} context Context for mapFunction.
          * @return {object} Object containing the ordered map of results.
          */
          function mapChildren(children, func, context) {...}





          share|improve this answer





















          • Thanks for taking the time to respond but this doesn't answer my question. Your answer restates things that I already know from reading the docs and looking at the code. I'm not asking how to use React.Children.map but rather, I want to know how the api notation tells me how to use React.Children.map. Thanks
            – psalaets
            Nov 17 at 17:02










          • As I mentioned, that this isn't standard notation. The answer explains what it really stands for. You can read it as React.Children.map is a function that accepts children argument, callback function argument and optional thisArg argument that will be used as this context in callback function. Can anyone read it like that without knowing what it stands for? I doubt that.
            – estus
            Nov 17 at 17:14










          • alright fair enough ✓
            – psalaets
            Nov 22 at 17:47











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          1 Answer
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          1 Answer
          1






          active

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          active

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          active

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          up vote
          0
          down vote



          accepted










          function[(thisArg)] isn't a standard denotation. As the documentation states, map




          Invokes a function on every immediate child contained within children with this set to thisArg.




          Children.map signature is similar to JavaScript Array.prototype.map. There are 3 arguments, 3rd argument is optional this context for callback function if needed.



          Children.map is documented better in source code:



          /**
          * Maps children that are typically specified as `props.children`.
          *
          * See https://reactjs.org/docs/react-api.html#reactchildrenmap
          *
          * The provided mapFunction(child, key, index) will be called for each
          * leaf child.
          *
          * @param {?*} children Children tree container.
          * @param {function(*, int)} func The map function.
          * @param {*} context Context for mapFunction.
          * @return {object} Object containing the ordered map of results.
          */
          function mapChildren(children, func, context) {...}





          share|improve this answer





















          • Thanks for taking the time to respond but this doesn't answer my question. Your answer restates things that I already know from reading the docs and looking at the code. I'm not asking how to use React.Children.map but rather, I want to know how the api notation tells me how to use React.Children.map. Thanks
            – psalaets
            Nov 17 at 17:02










          • As I mentioned, that this isn't standard notation. The answer explains what it really stands for. You can read it as React.Children.map is a function that accepts children argument, callback function argument and optional thisArg argument that will be used as this context in callback function. Can anyone read it like that without knowing what it stands for? I doubt that.
            – estus
            Nov 17 at 17:14










          • alright fair enough ✓
            – psalaets
            Nov 22 at 17:47















          up vote
          0
          down vote



          accepted










          function[(thisArg)] isn't a standard denotation. As the documentation states, map




          Invokes a function on every immediate child contained within children with this set to thisArg.




          Children.map signature is similar to JavaScript Array.prototype.map. There are 3 arguments, 3rd argument is optional this context for callback function if needed.



          Children.map is documented better in source code:



          /**
          * Maps children that are typically specified as `props.children`.
          *
          * See https://reactjs.org/docs/react-api.html#reactchildrenmap
          *
          * The provided mapFunction(child, key, index) will be called for each
          * leaf child.
          *
          * @param {?*} children Children tree container.
          * @param {function(*, int)} func The map function.
          * @param {*} context Context for mapFunction.
          * @return {object} Object containing the ordered map of results.
          */
          function mapChildren(children, func, context) {...}





          share|improve this answer





















          • Thanks for taking the time to respond but this doesn't answer my question. Your answer restates things that I already know from reading the docs and looking at the code. I'm not asking how to use React.Children.map but rather, I want to know how the api notation tells me how to use React.Children.map. Thanks
            – psalaets
            Nov 17 at 17:02










          • As I mentioned, that this isn't standard notation. The answer explains what it really stands for. You can read it as React.Children.map is a function that accepts children argument, callback function argument and optional thisArg argument that will be used as this context in callback function. Can anyone read it like that without knowing what it stands for? I doubt that.
            – estus
            Nov 17 at 17:14










          • alright fair enough ✓
            – psalaets
            Nov 22 at 17:47













          up vote
          0
          down vote



          accepted







          up vote
          0
          down vote



          accepted






          function[(thisArg)] isn't a standard denotation. As the documentation states, map




          Invokes a function on every immediate child contained within children with this set to thisArg.




          Children.map signature is similar to JavaScript Array.prototype.map. There are 3 arguments, 3rd argument is optional this context for callback function if needed.



          Children.map is documented better in source code:



          /**
          * Maps children that are typically specified as `props.children`.
          *
          * See https://reactjs.org/docs/react-api.html#reactchildrenmap
          *
          * The provided mapFunction(child, key, index) will be called for each
          * leaf child.
          *
          * @param {?*} children Children tree container.
          * @param {function(*, int)} func The map function.
          * @param {*} context Context for mapFunction.
          * @return {object} Object containing the ordered map of results.
          */
          function mapChildren(children, func, context) {...}





          share|improve this answer












          function[(thisArg)] isn't a standard denotation. As the documentation states, map




          Invokes a function on every immediate child contained within children with this set to thisArg.




          Children.map signature is similar to JavaScript Array.prototype.map. There are 3 arguments, 3rd argument is optional this context for callback function if needed.



          Children.map is documented better in source code:



          /**
          * Maps children that are typically specified as `props.children`.
          *
          * See https://reactjs.org/docs/react-api.html#reactchildrenmap
          *
          * The provided mapFunction(child, key, index) will be called for each
          * leaf child.
          *
          * @param {?*} children Children tree container.
          * @param {function(*, int)} func The map function.
          * @param {*} context Context for mapFunction.
          * @return {object} Object containing the ordered map of results.
          */
          function mapChildren(children, func, context) {...}






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 10 at 19:45









          estus

          64k2194201




          64k2194201












          • Thanks for taking the time to respond but this doesn't answer my question. Your answer restates things that I already know from reading the docs and looking at the code. I'm not asking how to use React.Children.map but rather, I want to know how the api notation tells me how to use React.Children.map. Thanks
            – psalaets
            Nov 17 at 17:02










          • As I mentioned, that this isn't standard notation. The answer explains what it really stands for. You can read it as React.Children.map is a function that accepts children argument, callback function argument and optional thisArg argument that will be used as this context in callback function. Can anyone read it like that without knowing what it stands for? I doubt that.
            – estus
            Nov 17 at 17:14










          • alright fair enough ✓
            – psalaets
            Nov 22 at 17:47


















          • Thanks for taking the time to respond but this doesn't answer my question. Your answer restates things that I already know from reading the docs and looking at the code. I'm not asking how to use React.Children.map but rather, I want to know how the api notation tells me how to use React.Children.map. Thanks
            – psalaets
            Nov 17 at 17:02










          • As I mentioned, that this isn't standard notation. The answer explains what it really stands for. You can read it as React.Children.map is a function that accepts children argument, callback function argument and optional thisArg argument that will be used as this context in callback function. Can anyone read it like that without knowing what it stands for? I doubt that.
            – estus
            Nov 17 at 17:14










          • alright fair enough ✓
            – psalaets
            Nov 22 at 17:47
















          Thanks for taking the time to respond but this doesn't answer my question. Your answer restates things that I already know from reading the docs and looking at the code. I'm not asking how to use React.Children.map but rather, I want to know how the api notation tells me how to use React.Children.map. Thanks
          – psalaets
          Nov 17 at 17:02




          Thanks for taking the time to respond but this doesn't answer my question. Your answer restates things that I already know from reading the docs and looking at the code. I'm not asking how to use React.Children.map but rather, I want to know how the api notation tells me how to use React.Children.map. Thanks
          – psalaets
          Nov 17 at 17:02












          As I mentioned, that this isn't standard notation. The answer explains what it really stands for. You can read it as React.Children.map is a function that accepts children argument, callback function argument and optional thisArg argument that will be used as this context in callback function. Can anyone read it like that without knowing what it stands for? I doubt that.
          – estus
          Nov 17 at 17:14




          As I mentioned, that this isn't standard notation. The answer explains what it really stands for. You can read it as React.Children.map is a function that accepts children argument, callback function argument and optional thisArg argument that will be used as this context in callback function. Can anyone read it like that without knowing what it stands for? I doubt that.
          – estus
          Nov 17 at 17:14












          alright fair enough ✓
          – psalaets
          Nov 22 at 17:47




          alright fair enough ✓
          – psalaets
          Nov 22 at 17:47


















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