What do the curly brackets in js mean?

Braces represent in JavaScript: block statements: used to group statements. Object literal: Represents a collection of key-value pairs. Array literal: Represents an ordered collection of values. Function body: Contains function execution code. Conditional statement: Contains statement blocks.

The meaning of braces in JavaScript

In JavaScript, braces {} have the following meanings:

1. Block Statement

Braces are used to create block statements to group multiple statements together. Block statements can be executed alone or as part of other statements. For example:

<code class="js">{
  console.log('Hello');
  console.log('World');
}</code>

2. Object literals

Braces are also used to create object literals. An object literal is a collection of key-value pairs, where the key is a string and the value can be any JavaScript data type. For example:

<code class="js">const person = {
  name: 'John',
  age: 30
};</code>

3. Array literals

Braces can also be used to create array literals. An array literal is an ordered collection of values. For example:

<code class="js">const numbers = [1, 2, 3, 4, 5];</code>

4. Function body

Braces are used to define the function body. The function body contains the code for executing the function. For example:

<code class="js">function sum(a, b) {
  return a + b;
}</code>

5. Conditional statement

Braces are used to contain statement blocks in conditional statements. For example:

<code class="js">if (condition) {
  // 代码块
} else {
  // 代码块
}</code>

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