How does connect take in mapStateToProps and mapDispatchToProps to create a higher order component?












0















I've been trying to figure out two things regarding redux





  1. mapDispatchToProps is a function that takes in dispatch as an argument, where is dispatch defined? and

  2. how does connect utilize mapStateToProps and mapDispatchToProps to create HOC(Higher Order Component) ?


If I understand correctly, connect is essentially a compositional function that takes the result of mapDispatchToProps and passes it to mapStateToProps then returns the result, which is a component, but how is it done?



Thank you for your time!






redux react-redux







share|improve this question





























    0















    I've been trying to figure out two things regarding redux





    1. mapDispatchToProps is a function that takes in dispatch as an argument, where is dispatch defined? and

    2. how does connect utilize mapStateToProps and mapDispatchToProps to create HOC(Higher Order Component) ?


    If I understand correctly, connect is essentially a compositional function that takes the result of mapDispatchToProps and passes it to mapStateToProps then returns the result, which is a component, but how is it done?



    Thank you for your time!






    redux react-redux







    share|improve this question



























      0












      0








      0








      I've been trying to figure out two things regarding redux





      1. mapDispatchToProps is a function that takes in dispatch as an argument, where is dispatch defined? and

      2. how does connect utilize mapStateToProps and mapDispatchToProps to create HOC(Higher Order Component) ?


      If I understand correctly, connect is essentially a compositional function that takes the result of mapDispatchToProps and passes it to mapStateToProps then returns the result, which is a component, but how is it done?



      Thank you for your time!






      redux react-redux







      share|improve this question
















      I've been trying to figure out two things regarding redux





      1. mapDispatchToProps is a function that takes in dispatch as an argument, where is dispatch defined? and

      2. how does connect utilize mapStateToProps and mapDispatchToProps to create HOC(Higher Order Component) ?


      If I understand correctly, connect is essentially a compositional function that takes the result of mapDispatchToProps and passes it to mapStateToProps then returns the result, which is a component, but how is it done?



      Thank you for your time!






      redux react-redux




      redux react-redux






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      share|improve this question













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      edited Nov 20 '18 at 8:18









      wgao19

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      asked Nov 19 '18 at 8:31









      Michael ChengMichael Cheng

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          1. mapDispatchToProps is a function that you will define. React-Redux calls your function with dispatch passed in as the first parameter. And that dispatch, in turn, comes from the store you provided to <Provider />.



          2. connect takes the mapState and mapDispatch that you will define, and create the wrapper function that, in the most common cases:




            • run mapState with state every time your store changes

            • run mapDispatch once when the component is instantiated


            The returns of both of these functions will be merged into your wrapped component.




          Seems that you'd like to figure out how it is done. This Dan Abramov's gist explains connect in a mental modal (simplified version of what it does).



          Hope that helps!






          share|improve this answer























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            1. mapDispatchToProps is a function that you will define. React-Redux calls your function with dispatch passed in as the first parameter. And that dispatch, in turn, comes from the store you provided to <Provider />.



            2. connect takes the mapState and mapDispatch that you will define, and create the wrapper function that, in the most common cases:




              • run mapState with state every time your store changes

              • run mapDispatch once when the component is instantiated


              The returns of both of these functions will be merged into your wrapped component.




            Seems that you'd like to figure out how it is done. This Dan Abramov's gist explains connect in a mental modal (simplified version of what it does).



            Hope that helps!






            share|improve this answer




























              0















              1. mapDispatchToProps is a function that you will define. React-Redux calls your function with dispatch passed in as the first parameter. And that dispatch, in turn, comes from the store you provided to <Provider />.



              2. connect takes the mapState and mapDispatch that you will define, and create the wrapper function that, in the most common cases:




                • run mapState with state every time your store changes

                • run mapDispatch once when the component is instantiated


                The returns of both of these functions will be merged into your wrapped component.




              Seems that you'd like to figure out how it is done. This Dan Abramov's gist explains connect in a mental modal (simplified version of what it does).



              Hope that helps!






              share|improve this answer


























                0












                0








                0








                1. mapDispatchToProps is a function that you will define. React-Redux calls your function with dispatch passed in as the first parameter. And that dispatch, in turn, comes from the store you provided to <Provider />.



                2. connect takes the mapState and mapDispatch that you will define, and create the wrapper function that, in the most common cases:




                  • run mapState with state every time your store changes

                  • run mapDispatch once when the component is instantiated


                  The returns of both of these functions will be merged into your wrapped component.




                Seems that you'd like to figure out how it is done. This Dan Abramov's gist explains connect in a mental modal (simplified version of what it does).



                Hope that helps!






                share|improve this answer














                1. mapDispatchToProps is a function that you will define. React-Redux calls your function with dispatch passed in as the first parameter. And that dispatch, in turn, comes from the store you provided to <Provider />.



                2. connect takes the mapState and mapDispatch that you will define, and create the wrapper function that, in the most common cases:




                  • run mapState with state every time your store changes

                  • run mapDispatch once when the component is instantiated


                  The returns of both of these functions will be merged into your wrapped component.




                Seems that you'd like to figure out how it is done. This Dan Abramov's gist explains connect in a mental modal (simplified version of what it does).



                Hope that helps!







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 20 '18 at 4:12









                wgao19wgao19

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                34326






























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