CRUD stands for "Create, Read, Update, and Delete," and refers to the four basic operations you can perform on data in a database or data store. These operations can also be performed on arrays in JavaScript. Here's how you can perform each of these operations on an array.
Create (Add)
To add an element to an array, you can use the push() method:
let fruits = ['apple', 'banana', 'orange'];
// Add a new element to the end of the array
fruits.push('mango');
console.log(fruits); // ['apple', 'banana', 'orange', 'mango']
You can also add an element to the beginning of the array using the unshift() method:
let fruits = ['apple', 'banana', 'orange'];
// Add a new element to the beginning of the array
fruits.unshift('pear');
console.log(fruits); // ['pear', 'apple', 'banana', 'orange']
Read (Retrieve)
To retrieve an element from an array, you can use the array's index:
let fruits = ['apple', 'banana', 'orange'];
let firstFruit = fruits[0]; // 'apple'
let secondFruit = fruits[1]; // 'banana'
let thirdFruit = fruits[2]; // 'orange'
You can also use the indexOf() method to find the index of a specific element in the array:
let fruits = ['apple', 'banana', 'orange'];
let index = fruits.indexOf('banana'); // 1
Update (Modify)
To update an element in an array, you can simply reassign the value at a specific index:
let fruits = ['apple', 'banana', 'orange'];
fruits[1] = 'pear';
console.log(fruits); // ['apple', 'pear', 'orange']
Delete (Remove)
To remove an element from an array, you can use the splice() method:
let fruits = ['apple', 'banana', 'orange'];
// Remove the second element (index 1)
fruits.splice(1, 1);
console.log(fruits); // ['apple', 'orange']
You can also use the shift() method to remove the first element of the array, or the pop() method to remove the last element:
let fruits = ['apple', 'banana', 'orange'];
// Remove the first element
fruits.shift();
console.log(fruits); // ['banana', 'orange']
// Remove the last element
fruits.pop();
console.log(fruits); // ['banana']
Conclusion
I hope after reading this article, you are clear about the CRUD operations in a JavaScript Array. If you have any questions or feedback, regarding this article, please let me know in the comment section. Thanks.