Complete 4-random.js exercise

Author: anosidium

Sprint-1/1-key-exercises/4-random.js

@@ -7,3 +7,9 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 // Try breaking down the expression and using documentation to explain what it means
 // It will help to think about the order in which expressions are evaluated
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+
+// num represents a random number in an inclusive range from 1 to 100
+// First, it starts with 100 - 1 + 1, which is equals to 100
+// Secondly, it multiply with Math.random(), which the function returns any number between 0 and 1, inclusive.
+// Thirdly, Math.floor() rounds down and returns the largest integer less than or equal to a given number
+// Finally, it adds 1