49. map() in JavaScript

The map() method is used for creating a new array by applying a provided function to each element in an existing array.
Essentially, it allows you to transform each element in an array and store the results in a new array,
while keeping the original array unchanged.

Example 1:

  console.log(squares);
  // Output: [1, 4, 9, 16, 25]


Example 2:

  const fullNames = people.map(person => `${person.firstName} ${person.lastName}`);

  console.log(fullNames);
  // Output: ["John Doe", "Jane Smith", "Sam Adams"]