Functions – Default Parameters
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does a default parameter provide a fallback value when no argument is passed?
2. Is = used to assign a default value to a parameter?
3. Is ':' a valid way to assign a default parameter value?
4. Does passing an argument override a parameter's default value?
5. Should 'let' be added before a parameter name in the list?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1function greet(name = "Guest") { ... } | AUses "Guest" as name if no argument is passed | |
| 2function add(a, b = 0) { ... } | Bgreet("Sam") | |
| 3Provides a fallback value when no argument is given | CUses 0 as b if no argument is passed for b | |
| 4Overrides the default value when an argument is passed | DWrong - default parameters use =, not == | |
| 5function add(a, b == 0) { ... } | Ename = "Guest" | |
| 6function mul(a, b: 1) { ... } | FWrong - default parameters use =, not : |
C
Definitions
=
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
function greet(name _ "Guest") {
2.
function add(a, b _ 0) {
3.
function power(base, exp = _) {
4.
function counter(step _ 1) {
5.
function scale(factor = _) {
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
function add(a, b == 0) {
B
console.log(a + b);
C
}
Question 2
A
function mul(a, b: 1) {
B
console.log(a * b);
C
}
Question 3
A
console.log("hi");
B
function greet(n "Al") {
C
console.log(n);
Question 4
A
console.log("go");
B
function power(let x = 2) {
C
console.log(x);
Question 5
A
let a = 1;
B
console.log(a);
C
Function timer(s = 30) {
D
console.log(s);
Answer Key
Functions – Default Parameters
Section A: Quick Questions
Q1
A — Yes
Q2
A — Yes
Q3
B — No
Q4
B — Yes
Q5
A — No
Section B: Match the Pairs
Q1
function greet(name = "Guest") { ... } → Uses "Guest" as name if no argument is passed
Q2
function add(a, b = 0) { ... } → Uses 0 as b if no argument is passed for b
Q3
Provides a fallback value when no argument is given → name = "Guest"
Q4
Overrides the default value when an argument is passed → greet("Sam")
Q5
function add(a, b == 0) { ... } → Wrong - default parameters use =, not ==
Q6
function mul(a, b: 1) { ... } → Wrong - default parameters use =, not :
Section C: Definitions
Q1
= — Assigns a default value to a parameter, used only when no argument is passed for it.Section D: Fill in the Blanks
Q1
function greet(name = "Guest") {Q2
function add(a, b = 0) {Q3
function power(base, exp = 2) {Q4
function counter(step = 1) {Q5
function scale(factor = 5) {Section E: Spot the Error
Q1
A — Default parameters use =, not ==, to assign the value.
Q2
A — Default parameters use =, not :, to assign the value.
Q3
B — Default parameters need an = before the value.
Q4
B — Don't add 'let' inside the parameter list.
Q5
C — 'function' must be lowercase - a capital F causes an error.