What array traversal methods do you know?

Main array iteration methods in JavaScript:

• forEach(callback) — executes a function for each element, does not return a new array.
• map(callback) — creates a new array with elements that are the result of calling callback on each element.
• filter(callback) — creates a new array with elements for which callback returns true.
• reduce(callback, initialValue) — reduces the array to a single value by accumulating the result.
• some(callback) — returns true if at least one element satisfies the condition.
• every(callback) — returns true if all elements satisfy the condition.
• find(callback) — returns the first element that satisfies the condition.
• findIndex(callback) — returns the index of the first element that satisfies the condition.

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 evens = numbers.filter(n => n % 2 === 0); // [2, 4]

These methods allow for convenient and declarative work with arrays.