Lära Creating Objects | Understanding and Working with Objects

Objects are a core feature in JavaScript, used to group related data and functions together. An object is a collection of properties, where each property is a key-value pair.

Use an object literal, which lets you define properties and their values in a single, concise statement.

const obj = {
  property: value,
}


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const user = {
  name: "Alice",
  age: 30,
  contact: {
    email: "alice@example.com",
    phone: "555-1234"
  }
};

console.log(JSON.stringify(user));

Another way to create objects in JavaScript is by using the Object constructor. The Object constructor is a built-in function that can create new objects at runtime. Unlike object literals, which define the object's structure and values in one step, the Object constructor creates a blank object, and then you add properties to it one by one. Referring to the user object literal above, you would need to manually add each property if you use the Object constructor.


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const user2 = new Object();
user2.name = "Alice";
user2.age = 30;
user2.contact = {};
user2.contact.email = "alice@example.com";
user2.contact.phone = "555-1234";

console.log(JSON.stringify(user2));

Choosing between object literals and the Object constructor depends on your needs. Object literals are preferred for their simplicity and readability, especially when you know the structure and values ahead of time. The Object constructor can be useful if you need to create objects dynamically or if you are working in situations where object creation is part of a more complex process. In most cases, use object literals for clarity and brevity, while the Object constructor is reserved for scenarios that require dynamic property assignment or when integrating with frameworks that expect constructor-based object creation.

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Objects are a core feature in JavaScript, used to group related data and functions together. An object is a collection of properties, where each property is a key-value pair.

Use an object literal, which lets you define properties and their values in a single, concise statement.

const obj = {
  property: value,
}


              12345678910
            
const user = {
  name: "Alice",
  age: 30,
  contact: {
    email: "alice@example.com",
    phone: "555-1234"
  }
};

console.log(JSON.stringify(user));


              12345678
            
const user2 = new Object();
user2.name = "Alice";
user2.age = 30;
user2.contact = {};
user2.contact.email = "alice@example.com";
user2.contact.phone = "555-1234";

console.log(JSON.stringify(user2));

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 2