Ternary Operator

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Does the ternary operator use ? and : together?

A Yes

B No

2. Is the ternary operator a shorthand for if/else?

A No

B Yes

3. Does = replace ? in a correct ternary expression?

A Yes

B No

4. Can a ternary expression's result be stored in a variable?

A Yes

B No

5. Does the condition need a semicolon before the ?

A No

B Yes

Match the Pairs

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

Left column		Right column
1age >= 18 ? "adult" : "minor"		AReturns "win" if score is over 50, otherwise "lose"
2score > 50 ? "win" : "lose"		B:
3A shorthand way of writing an if/else statement		CWrong - use :, not -, between the two values
4Separates the true and false results in a ternary		Dcondition ? valueIfTrue : valueIfFalse
5let x = a = "yes" : "no";		EReturns "adult" if age is 18 or more, otherwise "minor"
6let y = a ? "yes" - "no";		FWrong - use ?, not =, after the condition

Definitions

Fill in the Blanks

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

let status = age >= 18 _ "adult" : "minor";

let result = score > 50 ? "win" _ "lose";

let label = isReady _ "Go" : "Wait";

let output = temp > 30 ? "hot" _ "cool";

let grade = pass _ "Pass" : "Fail";

Spot the Error

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

Question 1

A let x = ok = "a" : "b";

B console.log(x);

C let y = 5;

Question 2

A let a = 5;

B let b = x > 3 - "hi" : "lo";

C console.log(b);

Question 3

A let n = 10;

B let z = 1;

C let lab = n==10 ? "a" ; "b";

D console.log(lab);

Question 4

A let age = 20;

B let t;

C console.log(t);

D t = age>=18 ? "a" "b";

Question 5

A let s = 75;

B let r;

C console.log(r);

D let ok2 = true;

E r = s>=50 && "p" : "f";

Answer Key

Ternary Operator

Section A: Quick Questions

A — Yes

B — Yes

B — No

A — Yes

A — No

Section B: Match the Pairs

age >= 18 ? "adult" : "minor" → Returns "adult" if age is 18 or more, otherwise "minor"

score > 50 ? "win" : "lose" → Returns "win" if score is over 50, otherwise "lose"

A shorthand way of writing an if/else statement → condition ? valueIfTrue : valueIfFalse

Separates the true and false results in a ternary → :

let x = a = "yes" : "no"; → Wrong - use ?, not =, after the condition

let y = a ? "yes" - "no"; → Wrong - use :, not -, between the two values

Section C: Definitions

?: — A shorthand operator that returns one value if a condition is true and another if false, without needing if/else.

Section D: Fill in the Blanks

let status = age >= 18 ? "adult" : "minor";

let result = score > 50 ? "win" : "lose";

let label = isReady ? "Go" : "Wait";

let output = temp > 30 ? "hot" : "cool";

let grade = pass ? "Pass" : "Fail";

Section E: Spot the Error

A — Ternary condition uses ?, not =, before the values.

B — Ternary needs ?, not -, after the condition.

C — Ternary needs :, not ;, between the two values.

D — Missing the colon : between the two ternary values.

E — Ternary condition uses ?, not &&, before the values.