Introduction to Objects
Objects are fundamental in JavaScript for representing complex, structured data. Unlike primitives such as string or number, objects allow you to group related information together under a single variable. This makes them ideal for modeling real-world entities, such as user profiles or products in an online store. For example:
- A user profile might include a user's
name,age, andemail, all stored as properties within one object; - A product could have a
title,price, andavailabilitystatus, making it easy to manage and access related data as a single unit.
12345678910111213// Creating an object to represent a user profile const user = { name: "Alex", age: 30, email: "alex@example.com" }; // Accessing properties console.log(user.name); // Output: Alex // Modifying a property user.age = 31; console.log(user.age); // Output: 31
You can access object properties using dot notation, such as user.name, or bracket notation, like user["email"]. To update a property, assign a new value to it, for example: user.age = 31. Objects are flexible, allowing you to add, remove, or change properties as needed, which is especially useful for modeling entities whose characteristics might change over time.
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Can you explain the difference between dot notation and bracket notation for accessing object properties?
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Objects are fundamental in JavaScript for representing complex, structured data. Unlike primitives such as string or number, objects allow you to group related information together under a single variable. This makes them ideal for modeling real-world entities, such as user profiles or products in an online store. For example:
- A user profile might include a user's
name,age, andemail, all stored as properties within one object; - A product could have a
title,price, andavailabilitystatus, making it easy to manage and access related data as a single unit.
12345678910111213// Creating an object to represent a user profile const user = { name: "Alex", age: 30, email: "alex@example.com" }; // Accessing properties console.log(user.name); // Output: Alex // Modifying a property user.age = 31; console.log(user.age); // Output: 31
You can access object properties using dot notation, such as user.name, or bracket notation, like user["email"]. To update a property, assign a new value to it, for example: user.age = 31. Objects are flexible, allowing you to add, remove, or change properties as needed, which is especially useful for modeling entities whose characteristics might change over time.
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