closures, recursion, axios

Question 1

What must the return value ofmyFunctionbe if the following expression is possible ?myFunction()();

• What does this code do? const wrap = value => () => value;

Answer 1

• It would return the return of the function, which should be a function.

Question 2

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

Answer 2

• When it is defined or lexical scope. It means it is determined where you wrote the code.

Question 3

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

Answer 3

• Closures. It keeps variables in memory. Like a functions backpack, it remembers stuff from functions outer function.

Question 4

What is a closure?

Answer 4

Aclosureis the combination of a function and the lexical environment within which that function was declared.

Question 5

What are 4 JS fundamentals?

Answer 5

Closures, event loop, prototypal inheritance, this