Arrow functions

- [Instructor] TypeScript has what acutely calls…arrow functions but which in reality…are a stripped down version of lambda expressions.…They're often used as a short form of functions…or to declare functions as you'll see in this next demo.…Let's create a new file and we'll call that lambda.ts…and what we're going to do is to create a function…in the traditional way and then using lambda expressions.…

So, let's create a function called multiplyit…and we'll say that that's equal to a function…that takes num1 which is a number,…num2 which is a number,…the whole function itself is a number…that should all look quite familiar,…and then inside the body of the function,…we'll just say return num1 * num 2;…a perfectly reasonable but small function.…

We can make this a little tighter and neater…using an arrow function.…What we'll say is var multiplyitLambda =…and now, instead of saying function…and passing in the variables,…we just pass in the variables,…num1, which is of type number,…num2, which is of type number,…and then we use the arrow which is an equal sign…