Objects – Creation and Access
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does {} create an object holding key-value pairs?
2. Does object.name access the value stored at key name?
3. Does bracket notation require quotes around the key?
4. Is () used to create an object in JavaScript?
5. Are keys and values separated by a colon in an object?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1{name: "Sam", age: 12} | ACreates an object with two key-value pairs | |
| 2person.name | BWrong - objects use curly braces, not round brackets | |
| 3Accesses a value using a key wrapped in quotes | CWrong - the key in bracket notation needs quotes | |
| 4Separates a key from its value inside an object | DAccesses the name value using dot notation | |
| 5let a = (name: "Sam"); | E: | |
| 6console.log(person[name]); | Fperson["age"] |
C
Definitions
{}
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
let person = _name: "Sam"};
2.
console.log(person_name);
3.
console.log(person_"name"]);
4.
let car = {color_ "red"};
5.
let dog = {name: "Rex"_;
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
let a = (name: "Sam");
B
console.log(a.name);
C
let b = {age: 12};
Question 2
A
let c = {name "Amy"};
B
console.log(c.name);
C
let d = {age: 9};
Question 3
A
let e = {name: "Bo"};
B
console.log(e#name);
C
let f = {age: 8};
Question 4
A
let g = {name: "Al"};
B
console.log(g[name]);
C
let h = {age: 7};
Question 5
A
let i = {name: "Zo"};
B
console.log(i.name);
C
let j = {age: 6;
Answer Key
Objects – Creation and Access
Section A: Quick Questions
Q1
B — Yes
Q2
B — Yes
Q3
A — Yes
Q4
A — No
Q5
A — Yes
Section B: Match the Pairs
Q1
{name: "Sam", age: 12} → Creates an object with two key-value pairs
Q2
person.name → Accesses the name value using dot notation
Q3
Accesses a value using a key wrapped in quotes → person["age"]
Q4
Separates a key from its value inside an object → :
Q5
let a = (name: "Sam"); → Wrong - objects use curly braces, not round brackets
Q6
console.log(person[name]); → Wrong - the key in bracket notation needs quotes
Section C: Definitions
Q1
{} — Creates an object holding key-value pairs, which can then be accessed by key.Section D: Fill in the Blanks
Q1
let person = {name: "Sam"};Q2
console.log(person.name);Q3
console.log(person["name"]);Q4
let car = {color: "red"};Q5
let dog = {name: "Rex"};Section E: Spot the Error
Q1
A — Objects use curly braces {}, not round brackets ().
Q2
A — Missing the colon between the key and its value.
Q3
B — Dot notation uses a period, not a #, before the key.
Q4
B — A key used in bracket notation needs quotes around it.
Q5
C — The object is missing its closing curly brace.