Arrays Recap

In this chapter, we learned how to work with arrays in JavaScript. We discovered that:

• We can create arrays using square brackets [] and elements separated by commas. For example: const list = [1, 2, 3, 3];.
• We access array elements using their indices, which start at 0. For example: console.log(list[0]); prints the first element of the list array.
• We can easily change array elements using their indices:
• For example: list[3] = 4; sets the fourth element of the list array to 4.
• Using the push() method, we can add new elements to the end of the array. For example: list.push(5) adds the value 5 to the end of the array.
• Using the pop() method, we can remove the last element from the array. For example: lastElement = list.pop() removes the last element from the list array and stores its value in the lastElement variable.
• Using the length property, we can find out the number of elements in the array. For example: numberOfElements = list.length stores the number of elements in the list array in the numberOfElements variable.
• Arrays can contain other arrays as their elements, which allows us to create nested arrays. For example: nestedArray = [[1, 2], [3, 4], [5, 6]].
• Text strings can also be considered arrays of characters, which we can access using their indices. For example: const text = "JavaScript"; and const firstChar = text[0]; stores the first character "J" in the firstChar variable.

Congratulations on completing the lesson on arrays! In the next lesson, we will look at loops and their use in JavaScript. Get ready for the next step in your programming adventure!