Just some notes I took while following along the TypeScript documentation

FunctionsExample.ts

//1.0 - Typed function types

//Synatx 1
let addition1 =
    function (x: number, y: number): number { return x + y; };

console.log(addition1(5, 5));

//Synatx 2
let addition2 = (x: number, y: number) => { return x + y; };

console.log(addition2(5, 5));

//Synatx 3 - Just explanatory 
let multiplication: (x: number, y: number) => number =
    function (x, y) { return x * y };


console.log(multiplication(10, 10));