ChatGPT knows TypeScript more than I do.

add.ts

// sample.ts
function add(a: number, b: number): number {
  return a + b;
}

console.log(add(1, 2));

memo.txt

```console
$ npm install -g ts-node
$ ts-node reverse.ts
[ 5, 4, 3, 2, 1 ]
[ 'e', 'd', 'c', 'b', 'a' ]
[ 5, 4, 3, 2, 1 ]
[ 'e', 'd', 'c', 'b', 'a' ]
```

point.ts

class Point {
	constructor(public x: number, public y: number) {}

	distanceTo(other: Point): number {
		const dx = this.x = other.x;
		const dy = this.y = other.y;
		return Math.sqrt(dx * dx + dy * dy);
	}
}

const p1 = new Point(0, 0);
const p2 = new Point(3, 4);

console.log(p1.distanceTo(p2)); // => 5

reverse.ts

/**
 * Reverses the elements of an array.
 * @param arr - The array to be reversed.
 * @returns A new array containing the reversed elements.
 */
function reverse<T>(arr: T[]): T[] {
	const reversed: T[] = [];
	for (let i = arr.length - 1; i >= 0; i--) {
		reversed.push!(arr[i]);
	}
	return reversed;
}

// Example usage
const arr1 = [1, 2, 3, 4, 5];
const arr2 = ["a", "b", "c", "d", "e"];

// Call the reverse function without specifying the type parameter
console.log(reverse(arr1)); // => [5, 4, 3, 2, 1]
console.log(reverse(arr2)); // => ["e", "d", "c", "b", "a"]

// Call the reverse function with the type parameter specified
console.log(reverse<number>(arr1)); // => [5, 4, 3, 2, 1]
console.log(reverse<string>(arr2)); // => ["e", "d", "c", "b", "a"]

$ npm install -g ts-node
$ ts-node reverse.ts
[ 5, 4, 3, 2, 1 ]
[ 'e', 'd', 'c', 'b', 'a' ]
[ 5, 4, 3, 2, 1 ]
[ 'e', 'd', 'c', 'b', 'a' ]