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

To use the size function from the Underscore library in TypeScript, you need to first install the Underscore library using a package manager like npm or yarn:


index.ts
npm install underscore
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or


index.ts
yarn add underscore
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After installing Underscore, you can import the size function like this:


index.ts
import { size } from "underscore";
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The size function takes an array, object, or string and returns the number of items in it. Here's an example:


index.ts
const myArray: string[] = ["apple", "banana", "cherry"];
const myObject = { a: 1, b: 2, c: 3 };
const myString = "hello, world";

console.log(size(myArray)); // 3
console.log(size(myObject)); // 3
console.log(size(myString)); // 12
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It's also possible to use size with generics to get the size of an array of any type:


index.ts
function arraySize<T>(arr: T[]): number {
  return size(arr);
}

const myArray: string[] = ["apple", "banana", "cherry"];
const myOtherArray: number[] = [1, 2, 3, 4];

console.log(arraySize(myArray)); // 3
console.log(arraySize(myOtherArray)); // 4
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Finally, you can add type annotations to make your code more explicit and easier to understand:


index.ts
import { size } from "underscore";

function arraySize<T>(arr: T[]): number {
  return size(arr);
}

const myArray: string[] = ["apple", "banana", "cherry"];
const myOtherArray: number[] = [1, 2, 3, 4];

console.log(arraySize<string>(myArray)); // 3
console.log(arraySize<number>(myOtherArray)); // 4
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