README.md

Currencies converter

Please run npm install and npm run start to see the converter in action.

<Form /> flowchart

Handling the bidirectional conversion with useEffect would have generated undesired and low performant rerenderings.

I then decided to handle conversions manually in the inputs and select event handlers.

Here's what happens within the Form Component.

graph TB;
    I1([1st input change event triggered]) -- onChange --> IEH[inputs events handler]

    I2([2nd input change event triggered]) -- onChange --> IEH
    
    IEH --> TISU[triggered input state updated] --> TIU[triggered input value updated]

    IEH --> C[Converter]
    
    C --> TAISU[targeted input state updated with converted value] --> TAIU[targeted input value updated]
    
    CS([currencies select change event triggered]) -- onChange --> SEH[select event handler]

    SEH[select event handler] --> C
    
    SEH[select event handler] --> SISU[select state updated] --> SVU[select value updated]
    

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Personal notes and concerns

A mono-directional converter would have looked poor, so I made the conversion bidirectional and added a chart.

I also created two themes that will be enabled based on the system preferences (dark/light mode)

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Unfortunately react queries was not compatible with the latest create react app stable version, so I created a custom hook (useRate) to handle data fetch;

I then anyway downgraded react script, react and react-dom due to the current lack of compatibility from vendors.