arrow functions

alternative syntax for defining functions

examples:

const foo = () => {};
 
// callback
function bar(callback) {
    callback();
};
 
bar(() => {
    console.log("this is a callback")
});
 
// will output: "this is a callback"

with typescript:

type Foo = () => void;
const foo: Foo = () => {};
 
type Bar = (param: int) => int;
const bar: Bar = (param) => { return param; };
 
// inline typed
const foobar = (param: int): int => { return param; };

caveats

• no hoisting compared to function keyword defined functions