Arrays are not fixed — you can add new values to them and remove existing values whenever needed.
In real-world applications, data keeps changing. New users are added, old records are removed, and lists are updated all the time. JavaScript provides simple methods to handle these changes in arrays.
Learning how to add and remove elements is essential for managing dynamic data.
Common Methods to Modify Arrays
- push() – adds an element at the end
- pop() – removes the last element
- unshift() – adds an element at the beginning
- shift() – removes the first element
These methods help you control array data easily.
The push() method adds a new element to the end of the array.
This is commonly used when adding new items to a list, such as adding products to a cart.
The pop() method removes the last element from the array.
This is useful when you want to undo an action or remove the most recently added item.
This example shows how unshift() adds a value at the start and shift() removes the first value.
By mastering these methods, students gain full control over array data and move closer to building dynamic, real-world JavaScript applications.