functions

Question 1

A function definition is a regular _______ where the value of the binding is a function.

Answer 1

binding

Question 2

Functions have a set of parameters and a ______, which contains the statements that are to be executed when the function is called.

Answer 2

body

Question 3

Some functions produce a value, such as power and square, and some don’t whose only result is a _____ _____.

Answer 3

side effect

Question 4

A ______ statement determines the value the function returns.

Answer 4

return

Question 5

A return keyword without an expression after it will cause the function to return ________.

Answer 5

undefined

Question 6

Functions that don’t have a return statement at all return _________.

Answer 6

undefined

Question 7

Parameters to a function behave like regular bindings, but their initial values are given by the _____ of the function, not the code in the function itself.

Answer 7

caller

Question 8

Each binding has a ______, which is the part of the program in which the binding is visible.

Answer 8

scope

Question 9

or bindings defined outside of any function or block, the scope is the whole program—you can refer to such bindings wherever you want. These are called _____.

Answer 9

global

Question 10

Bindings created for function parameters or declared inside a function can be referenced only in that function, so they are known as _____ bindings.

Answer 10

local

Question 11

Bindings declared with let and const are _____ to the block that they are declared in.

Answer 11

local

Question 12

let x = 10;
if (true) {
  let y = 20;
  var z = 30;
  console.log(x + y + z);
}

console.log(x + z);

what are both outputs?

Answer 12

60
40

var z is visible outside its block once declared

Question 13

Old-style bindings, created with the ______ keyword, are visible throughout the whole function that they appear in—or throughout the global scope, if they are not in a function.

Answer 13

var

Question 14

const halve = function(n) {
  return n / 2;
};

let n = 10;
console.log(halve(100));

console.log(n);

what are the outputs?

Answer 14

50

10

Question 15

________ scoping (sometimes known as static scoping ) is a convention used with many programming languages that sets the scope (range of functionality) of a variable so that it may only be called (referenced) from within the block of code in which it is defined. The scope is determined when the code is compiled.

Answer 15

Lexical

Question 16

Arrow functions were added in 2015, mostly to make it possible to write small function expressions in a less _______ way.

Answer 16

verbose

Question 17

In Javascript you are allowed to enter too many or too few arguments to a function. T/F

Answer 17

true

Question 18

If you pass too many arguments to a function, the extra ones are ________.

Answer 18

ignored

Question 19

If you write an = operator after a parameter, followed by an expression, the value of that expression will ______ the argument when it is not given.

Answer 19

replace

makes it the default value

Question 20

Being able to reference a specific instance of a local binding in an enclosing scope—is called _______.

Answer 20

closure

Question 21

A function that references bindings from local scopes around it is called __ _____.

Answer 21

a closure

Question 22

function multiplier(factor) {
  return number => number * factor;
}

let twice = multiplier(2);
console.log(twice(5));

what is the ouput?

Answer 22

10

multiplier is called and creates an environment in which its factor parameter is bound to 2. The function value it returns, which is stored in twice, remembers this environment. So when that is called, it multiplies its argument by 2.

Question 23

A function that calls itself is called _________.

Answer 23

recursive

Question 24

A ______ function is a specific kind of value-producing function that not only has no side effects but also doesn’t rely on side effects from other code.

Answer 24

pure