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Optimizing TypeScript Code with Advanced Type Manipulation and Generics

Tutorial September 02, 2024
typescript 

import React from "react";

type FormFieldProps<T> = {
  value: T;
  onChange: (value: T) => void;
};

function FormField<T>({ value, onChange }: FormFieldProps<T>) {
  return (
    <input
      type="text"
      value={String(value)}
      onChange={(e) => onChange(e.target.value as unknown as T)}
    />
  );
}

// Usage
const App = () => {
  const [name, setName] = React.useState<string>("");
  const [age, setAge] = React.useState<number>(0);

  return (
    <div>
      <FormField value={name} onChange={setName} />
      <FormField value={age} onChange={setAge} />
    </div>
  );
};

export default App;

To ensure that our FormField component only works with certain types, we can add type constraints.

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