Boolean Logic
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does && return true only if both sides are true?
2. Does || return true if either side is true?
3. Is 'and' a valid JavaScript operator for combining conditions?
4. Does ! reverse a boolean value?
5. Is a single & the same as && in JavaScript?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1isSunny && isWarm | AWrong - use || instead of the word 'or' | |
| 2isSunny || isWarm | BWrong - use && instead of the word 'and' | |
| 3Reverses a boolean's value | ChasTicket && hasID | |
| 4Combines two conditions, requiring both to be true | D!isOpen | |
| 5console.log(a and b); | ETrue only if both isSunny and isWarm are true | |
| 6console.log(x or y); | FTrue if at least one of isSunny or isWarm is true |
C
Definitions
&&
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
console.log(isSunny __ isWarm);
2.
console.log(isSunny __ isWarm);
3.
console.log(_isSunny);
4.
let ready = hasTicket __ hasID;
5.
let closed = _isOpen;
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
console.log(a and b);
B
let a = true;
C
let b = false;
Question 2
A
let x = true;
B
let y = false;
C
console.log(x or y);
Question 3
A
let flag = true;
B
console.log(not flag);
C
console.log(!flag);
Question 4
A
let p = true;
B
let q = false;
C
console.log(p & q);
Question 5
A
console.log(m | n);
B
let m = true;
C
let n = false;
Answer Key
Boolean Logic
Section A: Quick Questions
Q1
B — Yes
Q2
A — Yes
Q3
A — No
Q4
A — Yes
Q5
B — No
Section B: Match the Pairs
Q1
isSunny && isWarm → True only if both isSunny and isWarm are true
Q2
isSunny || isWarm → True if at least one of isSunny or isWarm is true
Q3
Reverses a boolean's value → !isOpen
Q4
Combines two conditions, requiring both to be true → hasTicket && hasID
Q5
console.log(a and b); → Wrong - use && instead of the word 'and'
Q6
console.log(x or y); → Wrong - use || instead of the word 'or'
Section C: Definitions
Q1
&& — A logical operator that returns true only if both conditions on either side are true.Section D: Fill in the Blanks
Q1
console.log(isSunny && isWarm);Q2
console.log(isSunny || isWarm);Q3
console.log(!isSunny);Q4
let ready = hasTicket && hasID;Q5
let closed = !isOpen;Section E: Spot the Error
Q1
A — Use &&, not the word 'and', to combine conditions.
Q2
C — Use ||, not the word 'or', to combine conditions.
Q3
B — Use !, not the word 'not', to reverse a boolean.
Q4
C — Use &&, not a single &, for logical AND.
Q5
A — Use ||, not a single |, for logical OR.