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JavaScript Data Structures
JavaScript Data Structures
Fundamentals of JavaScript Objects 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.
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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.
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Object Methods
Object methods are functions defined within objects, allowing data and related functionality to be coupled;
The
this
keyword 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
this
keyword and interact with them using dot notation.
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