How can I add new array elements at the beginning of an array in JavaScript?
An array is an important and fundamental data structure in JavaScript. To add new array elements at the beginning of an array, there are different, approach taken can vary depending on the use case. Here are some of the methods you can use:
Using unshift()
- The unshift() method is the simplest way to add an element to the beginning of an array.
- It takes up to three parameters, the value to be inserted at the beginning of the array, followed by additional elements, if present.
- It returns the updated length of the new array.
Using splice()
- The splice() method is more suitable when you need to insert multiple elements at the beginning of an array.
- Splice() takes three parameters – the first specifies the index position for insertion and the second is the number of elements to delete.
- The last parameter contains the elements you want to add at the beginning.
- It returns an array containing the deleted item.
Using concat()
- The concat() method is another way to add new array element to the beginning of an array.
- It takes one or more parameters, each of which are comma-separated array elements.
- It returns a new array with the elements added to the beginning.
These are some of the methods that can be used to add new array elements at the beginning of an array in JavaScript. Depending on your use case, you can opt for any one of these methods to modify your array.
