What are the methods of array assignment?

Array assignment methods in JavaScript include: single element assignment, multiple element assignment, array literal assignment, spread operator assignment, slice() method assignment and splice() method assignment.

Array assignment method

Array assignment is the process of assigning one or more values ​​to array elements. In JavaScript, there are several common array assignment methods:

1. Single element assignment

Use square bracket syntax to assign a value to an element at a specific index. As shown below:

<code class="javascript">const myArray = [];
myArray[0] = 10;</code>

2. Multiple element assignment

You can use comma separator to assign multiple values ​​to consecutive array indexes, as shown below:

<code class="javascript">const myArray = [];
myArray[0] = 10;
myArray[1] = 20;
myArray[2] = 30;</code>

3. Array literal assignment

Create an array literal using square brackets and value delimiters as follows:

<code class="javascript">const myArray = [10, 20, 30];</code>

4. Extension operator assignment

The extension operator (...) can be used to extend the value of another array or iterable object into an existing array, as follows:

<code class="javascript">const myArray = [10];
const anotherArray = [20, 30];
myArray.push(...anotherArray);</code>

5. slice() method assignment

The slice() method can be used to create a shallow copy of an existing array and assign it to a new array as follows:

<code class="javascript">const myArray = [10, 20, 30];
const newArray = myArray.slice(1, 3);</code>

6. splice() method assignment

The splice() method can be used to add or remove elements from an array and assign them to a new array, as shown below :

<code class="javascript">const myArray = [10, 20, 30];
const newArray = myArray.splice(1, 2, 15, 25);</code>

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