Accessing Array Elements in JavaScript

Accessing the elements of an array is similar to accessing the characters of a string. Each element of the array has its own index: the first element has the index 0, the second has the index 1, and so on. These indices are called also keys of the array elements. Let's look at an example. Let's say we have the following array:

javascriptlet arr = ['a', 'b', 'c'];

Let's display its elements:

javascriptconsole.log(arr[0]); // shows 'a'
console.log(arr[1]); // shows 'b'
console.log(arr[2]); // shows 'c'

Задание 1

Create an array with elements 1, 2, 3. Display each of these elements on the screen.

Задание 2

Given the following array:

javascriptlet arr = [1, 2, 3];

Display each of its elements.

Задание 3

Given the following array:

javascriptlet arr = [1, 2, 3];

Display the sum of the elements of this array on the screen.

Задание 4

Given the following array:

javascriptlet arr = ['a', 'b', 'c', 'd'];

Use this array to output the following string:

javascript'a+b+c+d'