Naming functions with verbs
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which is the better name for a function that adds up a shopping bill?
2. Which function name is written correctly in JavaScript?
3. Which name starts with a verb?
4. A function checks if a player has won. Which name is more meaningful?
5. Which function name uses camelCase correctly?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1function calculateTotal(price, qty) { | Afunction checkPassword(pass) { | |
| 2function printMenu() { | BA good function name: it starts with the verb calculate and clearly says the function works out a total. | |
| 3Start a function name with a verb so it describes an action | CThe function name has a space in it, so JavaScript sees two separate words. Use calculateTotal instead. | |
| 4Write the function name in camelCase with no spaces, capitalising each new word after the first | DThe name x is not meaningful and has no verb. A better name would be addNumbers. | |
| 5function calculate total(price, qty) { | Efunction getHighScore() { | |
| 6function x(a, b) { | FA good function name: it starts with the verb print and names what is printed, the menu. |
C
Definitions
calculateTotal
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
________ calculateTotal(a, b) {
return a + b;
}
2.
function showScore() { console.log(10); }
_________();
3.
function calculateTotal(a, b) {return a+b;}
let total = calculate_____(5, 3);
4.
function _________Area(w, h) {return w*h;}
calculateArea(3, 4);
5.
function _________() { console.log("Hi"); }
printMenu();
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
let score1 = 5;
B
function add Scores(a, b) {
C
return a + b;
D
}
Question 2
A
function print_menu() {
B
console.log('Pizza');
C
}
D
printMenu();
Question 3
A
let player = 'Mia';
B
let level = 3;
C
function level(n) {
D
console.log(n);
E
}
F
showLevel(level);
Question 4
A
let price = 20;
B
function ApplyDiscount(p) {
C
return p * 0.9;
D
}
Question 5
A
function isAdult(age) {
B
return age >= 18;
C
}
D
console.log(isadult(20));
Answer Key
Naming functions with verbs
Section A: Quick Questions
Q1
A — calculateTotal
Q2
B — printMenu
Q3
A — drawSquare
Q4
A — checkWinner
Q5
B — getUserName
Section B: Match the Pairs
Q1
function calculateTotal(price, qty) { → A good function name: it starts with the verb calculate and clearly says the function works out a total.
Q2
function printMenu() { → A good function name: it starts with the verb print and names what is printed, the menu.
Q3
Start a function name with a verb so it describes an action → function checkPassword(pass) {
Q4
Write the function name in camelCase with no spaces, capitalising each new word after the first → function getHighScore() {
Q5
function calculate total(price, qty) { → The function name has a space in it, so JavaScript sees two separate words. Use calculateTotal instead.
Q6
function x(a, b) { → The name x is not meaningful and has no verb. A better name would be addNumbers.
Section C: Definitions
Q1
calculateTotal — A function name is a camelCase verb phrase that says what the function does, like calculateTotal or printMenu. Start with a verb, make it meaningful and use no spaces.Section D: Fill in the Blanks
Q1
function calculateTotal(a, b) {
return a + b;
}Q2
function showScore() { console.log(10); }
showScore();Q3
function calculateTotal(a, b) {return a+b;}
let total = calculateTotal(5, 3);Q4
function calculateArea(w, h) {return w*h;}
calculateArea(3, 4);Q5
function printMenu() { console.log("Hi"); }
printMenu();Section E: Spot the Error
Q1
B — A function name cannot contain spaces. Write the words together in camelCase: addScores.
Q2
A — Function names use camelCase, not underscores. It should be printMenu, which also matches the call on line 4.
Q3
C — The name 'level' is a noun and does not say what the function does. Start with a verb: showLevel.
Q4
B — camelCase names start with a lowercase letter. It should be applyDiscount.
Q5
D — The call must use the exact camelCase name. isadult is not defined; it should be isAdult with a capital A.