block8.ts

const user1= {firstName: "Georges", lastName: "Abitbol", age: 43}
const user2= {firstName: "Joel", lastName: "Hammond", age: 25}

// Classic way of writing a map
// Here TypeScript will know that the result is an Array<string>
_.map([user1, user2], user => user.firstName)

//Shortcut way of writing a map
//Previously known as the pluck function
//TypeScript could not infer the return type, and will be an Array<any>
_.map([user1, user2], 'firstName');