Arrays, objects and data · 15 MIN

Arrays and array methods

Arrays are ordered collections. push and pop change the end; map transforms values; filter selects values; find locates one value; reduce combines values. Prefer methods that communicate intent instead of complex manual loops.

Try it yourself

Change the example, run it, and explain the result in your own words. Then create one variation of your own.

Key idea

Use the example as a starting point, not something to memorize. Practise, inspect the result and make small improvements.

Code example

const prices = [10, 20, 30];
const withTax = prices.map(price => price * 1.075);
console.log(withTax);

Practise this lesson