ES6

Question 1

can explain how => arrow functions are different from function(){} functions

Answer 1

=> is the way of writing ‘function’ in ES6. So it’s the same function() {} - it does not bind this implicitly.

Question 2

can define a class with both class and instance properties

Answer 2

RESEARCH

Question 3

can import and export a single default export

Answer 3

RESEARCH

Question 4

can import and export a set of named exports

Answer 4

RESEARCH

Question 5

knows how to use async and await

Answer 5

RESEARCH

Question 6

Explain how “class” transpiles to an ES5 Constructor

Answer 6

• Class allows us to define the constructor function (via class and constructor).
• The constructor function’s prototype object’s prototype (via extends)
• Methods are put on the constructor’s prototype object
• Methods are put on the constructor function itself (static)
• We can reference the base “class” constructor and its prototype information concisely and portably

Question 7

What is the difference between let, const, and var?

Answer 7

const means that the identifier can’t be reassigned

let and var allow you to reassign variables

Question 8

What is the difference between context and lexical scope?

Answer 8

context refers to ‘this’

lexical scope is everything in a function object

Question 9

What is the difference between lexical scope and execution scope?

Answer 9

Execution scope is where and how a function is called in a program