how to use the memoize function from the underscore library in typescript

To use the memoize function from the Underscore.js library in TypeScript, you can follow the steps below:

1. Install the Underscore.js library from npm using the following command:

index.ts
npm install underscore
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2. Create a TypeScript file and import the memoize function from the underscore module:

index.ts
import { memoize } from "underscore";
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3. Define a function that needs to be memoized. Here's an example:

index.ts
function fibonacci(n: number): number {
  if (n <= 1) {
    return n;
  }
  return fibonacci(n - 1) + fibonacci(n - 2);
}
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4. Use the memoize function to memoize the fibonacci function:

index.ts
const memoizedFibonacci = memoize(fibonacci);
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5. Call the memoizedFibonacci function with an argument:

index.ts
console.log(memoizedFibonacci(10)); // Output: 55
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The first time you call memoizedFibonacci with an argument, it will compute the result and cache it. Subsequent calls to memoizedFibonacci with the same argument will return the cached result without computing it again.

You can also pass a custom caching function to the memoize function as the second argument. This allows you to customize how the cache is stored and retrieved.