javascript-closures

Question 1

What must the return value of myFunction be if the following expression is possible?

myFunction()();

Answer 1

Another function.

Question 2

What does this code do?

const wrap = value => () => value;

Answer 2

Returns the anonymous arrow function definition.

Question 3

In JavaScript, when is a function’s scope determined; when it is called or when it is defined?

Answer 3

When it is defined.

Question 4

What allows JavaScript functions to “remember” values from their surroundings?

Answer 4

Closure.