Functions – Scope
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does a variable declared with let inside a function stay local to it?
2. Can code outside a function access a variable declared inside it?
3. Does each function create its own separate scope?
4. Can a variable be used before it's declared inside its own scope?
5. Does calling a function twice create two separate variable scopes?
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() { let name = "Sam"; } | AWrong - name is scoped inside greet and isn't accessible outside it | |
| 2function calc() { let total = 10; return total; } | Blet count = 5; | |
| 3The area of code where a variable can be accessed | CDeclares name as a variable scoped inside greet | |
| 4Keeps a variable local so it can't be accessed outside its function | Dscope | |
| 5function greet() { let name = "Sam"; } console.log(name); | EDeclares total as a variable scoped inside calc | |
| 6function calc() { let total = 5; } console.log(total); | FWrong - total is scoped inside calc and isn't accessible outside it |
C
Definitions
scope
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
function greet() {
___ name = "Sam";
console.log(name);
}
2.
function calc() {
let total = 10;
______ total;
}
console.log(calc());
3.
function show() {
___ count = 5;
console.log(count);
}
4.
function test() {
if (true) {
___ x = 1;
console.log(x);
}
}
5.
function calcArea(side) {
let area = side * side;
______ area;
}
console.log(calcArea(4));
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
console.log(msg);
B
function say() {
C
let msg = "Hi";
D
}
Question 2
A
console.log(result);
B
function add(a, b) {
C
let result = a + b;
D
return result;
E
}
Question 3
A
function greet() {
B
console.log(user);
C
let user = "Amy";
D
}
Question 4
A
function calcArea(s) {
B
console.log(area);
C
let area = s * s;
D
return area;
E
}
Question 5
A
function outer() {
B
let x = 1;
C
console.log(y);
D
}
Answer Key
Functions – Scope
Section A: Quick Questions
Q1
A — Yes
Q2
A — No
Q3
A — Yes
Q4
B — No
Q5
B — Yes
Section B: Match the Pairs
Q1
function greet() { let name = "Sam"; } → Declares name as a variable scoped inside greet
Q2
function calc() { let total = 10; return total; } → Declares total as a variable scoped inside calc
Q3
The area of code where a variable can be accessed → scope
Q4
Keeps a variable local so it can't be accessed outside its function → let count = 5;
Q5
function greet() { let name = "Sam"; } console.log(name); → Wrong - name is scoped inside greet and isn't accessible outside it
Q6
function calc() { let total = 5; } console.log(total); → Wrong - total is scoped inside calc and isn't accessible outside it
Section C: Definitions
Q1
scope — The area of code where a variable can be accessed; variables declared inside a function are local to it.Section D: Fill in the Blanks
Q1
function greet() {
let name = "Sam";
console.log(name);
}Q2
function calc() {
let total = 10;
return total;
}
console.log(calc());Q3
function show() {
let count = 5;
console.log(count);
}Q4
function test() {
if (true) {
let x = 1;
console.log(x);
}
}Q5
function calcArea(side) {
let area = side * side;
return area;
}
console.log(calcArea(4));Section E: Spot the Error
Q1
A — msg is scoped inside say() and isn't accessible before or outside it.
Q2
A — result is scoped inside add() and isn't accessible outside it.
Q3
B — user is used before it's declared inside the function's scope.
Q4
B — area is used before it's declared inside the function's scope.
Q5
C — y was never declared anywhere in scope, so it can't be used.