The six methods that turn JavaScript arrays from basic lists into powerful tools.

When I first learned arrays, I thought I was done. Create an array, access elements by index, loop through them with for — what else is there? Then I discovered array methods, and it felt like upgrading from a bicycle to a car.

Array methods are built-in functions that every array comes with. They let you add, remove, transform, filter, and reduce data — often in a single line of code. No manual loops, no index tracking, no off-by-one errors. Just tell the array what you want, and it handles the how .

In the ChaiCode Web Dev Cohort 2026, array methods came up almost immediately after we learned the basics. And honestly, these six methods cover probably 90% of what you'll ever do with arrays in real projects. Let's go through each one.

1. push() and pop() — Adding and Removing from the End

These two are the simplest array methods.…