QUESTION: Какие методы массивов для итерации?

Array iteration in JavaScript is performed using built-in higher-order methods. They make code more declarative, readable, and compact compared to traditional loops like for, eliminating the need to manually manage indices and counters.

The forEach method simply executes the provided function for each element of the array, without returning any value. This is convenient for side effects, such as logging to the console or sending data to a server. The map method transforms each element of the array according to the provided function and returns a new array of the same length with the modified data.

The filter method selects elements based on a given condition, returning a new array consisting only of those elements for which the callback function returned true. The reduce method reduces an array to a single value by sequentially applying a function to an accumulator and the current element, making it indispensable for calculating sums, grouping data, or building complex structures.

Specialized methods are used to find specific elements. The find method returns the first found element that satisfies the condition, and findIndex returns its index. Finally, the checking methods some and every allow you to evaluate the contents of the array: some checks if at least one element matches the condition, and every checks if all elements satisfy the given condition.