Is TypeScript Right for you?

Type checking reduces bugs by 15%.

> npm install -g typescript

const Greeter = (person) => {
    return `Hello ${person}`
}

let user = "Pickle Rick"

document.body.innerHTML = Greeter(user);

var Greeter = function (person) {
    return "Hello " + person;
};
var user = "Pickle Rick";
document.body.innerHTML = Greeter(user);

greeter.ts

greeter.js

const Greeter = (person:string) => {
    return `Hello ${person}`
}

let user = [1,2,3]

document.body.innerHTML = Greeter(user);

error TS2345: Argument of type 'number[]' is not assignable to parameter of type 'string'.