Discuss arrow function.

Q: Discuss arrow function.

let getName = ((firstName, lastName) => { let myRole = 'Software Developer'; return `My name is ${firstName} ${lastName} I am a ${myRole}.`; });

Difficulty: 5/10

lexical this, syntax brevity, binding

Arrow function expressions is a new syntax to writing ordinary function expressions

Unlike ordinary functions, arrow functions do not have their own this.The value of this inside an arrow function is always bound to the value of this in the closest non-arrow function.

Scenario Questions

0-2 years experience

1You have an object `user` with a `name` property and a method that calls `setTimeout` to log `this.name`. How would you use an arrow function inside `setTimeout` so that `this` still refers to `user`?
2What will `console.log(((a, b) => a + b).length);` output and why?
3If you need to return an object literal from an arrow function without a block, how would you write the syntax?

2-5 years experience

Follow-up Questions

Can you walk me through how `this` is resolved in that scenario?
What alternatives would you consider if an arrow function caused a bug?
How would you verify that your change didn't introduce regressions?