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JavaScript Data Structures
JavaScript Data Structures
1. Introduction and Prerequisites
2. Objects Fundamentals
Understanding ObjectsObject CreationNested PropertiesChallenge: Creating an ObjectAccessing Object PropertiesChallenge: Accessing Object PropertiesWorking with PropertiesChallenge: Modifying and Extending ObjectObject MethodsProperties in MethodsChallenge: Working with Object MethodsObject Fundamentals Sum Up
3. Advanced Object Manipulation
Object Fundamentals Sum Up
Objects in JavaScript
- Objects in JavaScript are complex data types used to represent real-world entities;
- Objects consist of key-value pairs, where each key (property) has an associated value;
- Keys (property names) can be strings, and values can be of any valid JavaScript data type;
- Objects can store nested and grouped data for organizing complex information.
Object Creation and Property Naming
- Object literals enclosed in curly braces
{}are a common way to create objects in JavaScript; - Object keys (property names) can be enclosed in quotes (single or double) or left unquoted, with certain naming rules;
- Quoted keys allow for arbitrary strings with spaces and special characters;
- Unquoted keys should start with a letter or specific characters like
_,$, or any Unicode character.
Accessing Object Properties
- Two common methods for accessing object properties are dot notation and square brackets;
- Dot notation is used when the property name is known in advance, while square brackets are useful when the name is unknown or stored in a variable;
- Nested properties are accessed using dot notation with a path separated by dots.
Object Methods
- Object methods are functions defined within objects, allowing data and related functionality to be coupled;
- The
thiskeyword refers to the object calling the method, enabling access to its properties; - Object methods offer logical organization, data encapsulation, and improved code readability;
- Methods can access object properties using the
thiskeyword and interact with them using dot notation.
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