Functions with several parameters

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Which function header correctly declares two parameters?

A function add(a, b) {

B function add(a b) {

2. What does add(2, 3) do when add is function add(a, b) { return a + b; }?

A a is 3 and b is 2, so it returns 23

B a is 2 and b is 3, so it returns 5

3. A function is declared as function greet(name, age). Which call gives the arguments in the right order?

A greet("Mia", 13)

B greet(13, "Mia")

4. For function subtract(a, b) { return a - b; }, which call gives 10 - 4?

A subtract(4, 10)

B subtract(10, 4)

5. For function add(a, b) { return a + b; }, what is the value of b in the call add(5)?

A undefined

B 0

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1function add(a, b) { return a + b; }		AThe call gives only one argument for a function with two parameters, so b is undefined. It should be add(2, 3).
2add(2, 3)		BThe parameters a and b are not separated by a comma. It should be add(a, b).
3Order matters: the first argument goes to the first parameter, so swapping arguments can change the result		Cadd(5) // b is undefined
4If you give too few arguments, the missing parameter is undefined		DDeclares a function with two parameters, a and b, separated by a comma
5function add(a b) { return a + b; }		Efunction say(name, age) { } say(12, "Ava")
6add(2)		FCalls add with two arguments: 2 goes to a and 3 goes to b

Definitions

function add(a, b) {

Fill in the Blanks

Complete each line of code by filling in the missing parts.

________ add(a, b) { return a + b; }

function add(a, _) { return a + b; }

console.log(add(2, _)); // prints 5

function sub(a, b) { return a - b; } console.log(sub(__, 4)); // prints 6

function show(a, b) { console.log(b); } show(5); // prints _________

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A function area(w, h) {

B return w * x;

C }

D console.log(area(4, 3));

Question 2

A function add(a b) {

B return a + b;

C }

D console.log(add(2, 3));

Question 3

A function total(price, qty) {

B return price * qty;

C }

D console.log(total(2.5));

Question 4

A function subtract(a, b) {

B // take b away from a

C return b - a;

D }

E console.log(subtract(10, 4));

Question 5

A function label(first, last) {

B return last + ' ' + first;

C }

D let s = label('Ava', 'Lee');

Answer Key

Functions with several parameters

Section A: Quick Questions

A — function add(a, b) {

B — a is 2 and b is 3, so it returns 5

A — greet("Mia", 13)

B — subtract(10, 4)

A — undefined

Section B: Match the Pairs

function add(a, b) { return a + b; } → Declares a function with two parameters, a and b, separated by a comma

add(2, 3) → Calls add with two arguments: 2 goes to a and 3 goes to b

Order matters: the first argument goes to the first parameter, so swapping arguments can change the result → function say(name, age) { } say(12, "Ava")

If you give too few arguments, the missing parameter is undefined → add(5) // b is undefined

function add(a b) { return a + b; } → The parameters a and b are not separated by a comma. It should be add(a, b).

add(2) → The call gives only one argument for a function with two parameters, so b is undefined. It should be add(2, 3).

Section C: Definitions

function add(a, b) { — Separate several parameters with commas. A call like add(2, 3) must give one argument for each, in the same order. A missing argument becomes undefined.

Section D: Fill in the Blanks

function add(a, b) {
  return a + b;
}

function add(a, b) { return a + b; }

console.log(add(2, 3)); // prints 5

function sub(a, b) { return a - b; }
console.log(sub(10, 4)); // prints 6

function show(a, b) { console.log(b); }
show(5); // prints undefined

Section E: Spot the Error

B — The function only has the parameters w and h, so x is not defined. It should be return w * h;

A — Several parameters must be separated by a comma. It should be function add(a, b) {

D — The call gives only one argument for two parameters, so qty is undefined and the answer is NaN. It should be total(2.5, 4).

C — The order matters. This takes a away from b, so subtract(10, 4) gives -6. It should be return a - b;

B — The parameters are used in the wrong order, so the name comes out as 'Lee Ava'. It should be return first + ' ' + last;