What array methods do you know in JavaScript?

In JavaScript, arrays have many useful methods for working with data. Here are some of them:

• push() — adds element(s) to the end of the array.
• pop() — removes the last element and returns it.
• shift() — removes the first element and returns it.
• unshift() — adds element(s) to the beginning of the array.
• forEach() — executes a function for each element in the array.
• map() — creates a new array by applying a function to each element.
• filter() — creates a new array with elements that pass a test.
• reduce() — reduces the array to a single value by applying a function.
• find() — returns the first element that satisfies a condition.
• some() — checks if at least one element satisfies a condition.
• every() — checks if all elements satisfy a condition.
• includes() — checks if the array contains a certain element.
• slice() — returns a copy of a portion of the array.
• splice() — changes the array by adding or removing elements.
• sort() — sorts the elements of the array.

Example of using map and filter:

const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map(n => n * 2); // [2, 4, 6, 8, 10]
const even = numbers.filter(n => n % 2 === 0); // [2, 4]