Objects – Creation and Access

Creates an object holding key-value pairs, which can then be accessed by key.

Part of: JavaScript Coding without HTML and CSS — Module 32, ACARA Digital Technologies Years 9–10 — Modular and Object-Oriented Programming (JavaScript) — Module 49

Understanding Objects – Creation and Access in JavaScript

What it does: Bracket notation requires the key as a quoted string. The colon divides each key from its corresponding value. Curly braces hold the key-value pairs of an object. Dot notation accesses a value using its key directly. Objects use curly braces {}, not round brackets. Bracket notation can use a variable, unlike dot notation. Every { used to create an object needs a matching }. Round brackets don't create an object in JavaScript.

Common mistakes: Objects use curly braces {}, not round brackets (). Missing the colon between the key and its value.

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Free printable worksheet with full answer key — or add this module to a class and your students practise it interactively.

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This module's key terms are also in a printable crossword (Modules 31–40) and word search (Modules 21–52).

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Learning

Duo

Does {} create an object holding key-value pairs?

YesNo

Matches

let a = (name: "Sam");

↓

Wrong - objects use curly braces, not round brackets

Applying

Meanings

Term

{}

Meaning

Creates an object holding key-value pairs, which can then be accessed by key.

Practice

let person = {name: "Sam", age: 12};

Testing

Gaps

let person = name: "Sam"};

Check Answer

Spots

1let a = (name: "Sam");

2console.log(a.name);

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Quick Questions

1. Does {} create an object holding key-value pairs?

A. No

B. Yes ✓

Curly braces hold the key-value pairs of an object.

2. Does object.name access the value stored at key name?

A. No

B. Yes ✓

Dot notation accesses a value using its key directly.

3. Does bracket notation require quotes around the key?

A. Yes ✓

B. No

Bracket notation needs the key as a string, like ["name"].

4. Is () used to create an object in JavaScript?

A. No ✓

B. Yes

Objects use curly braces {}, not round brackets.

5. Are keys and values separated by a colon in an object?

A. Yes ✓

B. No

Each key-value pair uses a colon, like name: "Sam".

Match the Pairs

{name: "Sam", age: 12} → Creates an object with two key-value pairs

person.name → Accesses the name value using dot notation

Accesses a value using a key wrapped in quotes → person["age"]

Separates a key from its value inside an object → :

let a = (name: "Sam"); → Wrong - objects use curly braces, not round brackets

console.log(person[name]); → Wrong - the key in bracket notation needs quotes

Key Term

{}

Creates an object holding key-value pairs, which can then be accessed by key.

Fill in the Blanks

1. let person = {name: "Sam"};

Hint: Type the symbol that opens an object.

2. console.log(person.name);

Hint: Type the symbol used for dot notation access.

3. console.log(person["name"]);

Hint: Type the symbol that opens a bracket notation access.

4. let car = {color: "red"};

Hint: Type the symbol that separates a key from its value.

5. let dog = {name: "Rex"};

Hint: Type the symbol that closes an object.

Spot the Error

Question 1

A let a = (name: "Sam");

B console.log(a.name);

C let b = {age: 12};

Line A — Objects use curly braces {}, not round brackets ().

Question 2

A let c = {name "Amy"};

B console.log(c.name);

C let d = {age: 9};

Line A — Missing the colon between the key and its value.

Question 3

A let e = {name: "Bo"};

B console.log(e#name);

C let f = {age: 8};

Line B — Dot notation uses a period, not a #, before the key.

Question 4

A let g = {name: "Al"};

B console.log(g[name]);

C let h = {age: 7};

Line B — A key used in bracket notation needs quotes around it.

Question 5

A let i = {name: "Zo"};

B console.log(i.name);

C let j = {age: 6;

Line C — The object is missing its closing curly brace.

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