Component-based design transformed the frontend landscape by fundamentally changing the way web apps are built. React's new Hooks API is set to do that again, this time for function logic.

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We defined reducers as a function that accepts two inputs and produces a single output. What about reducers that don't immediately look like reducers? You may already know a few!

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You have a reducer that's almost perfect, but it's not quite right. A transducer can take your existing reducer and fit it to the task at hand.

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It may not be immediately obvious through the many modern layers of abstraction, but code can often be boiled down to piping some number of inputs to some other form of output. Reducers play a key role in this process.

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A common task in front-end development is taking a string of user input and filtering a dataset for rows that contain that input. Let's explore that.

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In which our intrepid hero embarks upon a perilous quest.

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