Sets – Basics
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does new Set() create a new Set object?
2. Does add() add a value to a Set?
3. Does a Set automatically remove duplicate values?
4. Is 'set' with a lowercase s valid for creating a Set?
5. Must 'add' be written in lowercase?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1new Set() | AWrong - 'Set' must start with a capital S | |
| 2nums.add(1) | Bcolors.add("red") | |
| 3Automatically removes duplicate values from a collection | CSet | |
| 4Inserts a value into a Set | DWrong - 'add' must start with a lowercase a | |
| 5let s = new set(); | ECreates a new, empty Set | |
| 6s.Add(1); | FAdds the value 1 to the nums Set |
C
Definitions
new Set()
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
let nums = ___ Set();
2.
nums.___(1);
3.
let colors = ___ Set();
4.
colors.___("red");
5.
nums.___(2);
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
let s = new set();
B
s.add(1);
C
console.log(s);
Question 2
A
let s2 = new Set();
B
s2.Add(2);
C
console.log(s2);
Question 3
A
let s3 = new Set();
B
s3.add(3);
C
s3.add(3);
Question 4
A
let a = 1;
B
let b = 2;
C
let s5 = new set();
Question 5
A
let s6 = new Set();
B
s6.add(4);
C
console.log(s6);
D
s6.Add(5);
Answer Key
Sets – Basics
Section A: Quick Questions
Q1
B — Yes
Q2
A — Yes
Q3
B — Yes
Q4
A — No
Q5
A — Yes
Section B: Match the Pairs
Q1
new Set() → Creates a new, empty Set
Q2
nums.add(1) → Adds the value 1 to the nums Set
Q3
Automatically removes duplicate values from a collection → Set
Q4
Inserts a value into a Set → colors.add("red")
Q5
let s = new set(); → Wrong - 'Set' must start with a capital S
Q6
s.Add(1); → Wrong - 'add' must start with a lowercase a
Section C: Definitions
Q1
new Set() — Creates a new Set, a built-in object that stores only unique values.Section D: Fill in the Blanks
Q1
let nums = new Set();Q2
nums.add(1);Q3
let colors = new Set();Q4
colors.add("red");Q5
nums.add(2);Section E: Spot the Error
Q1
A — 'Set' must start with a capital S, not lowercase.
Q2
B — 'add' must be lowercase - a capital A causes an error.
Q3
C — This line is actually correct - adding a duplicate just has no effect.
Q4
C — 'Set' must start with a capital S, not lowercase.
Q5
D — 'add' must be lowercase - a capital A causes an error.