Sprint 1 exercises: complete 4-random.js with explanation

Author: Richiealx

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

@@ -3,7 +3,10 @@ const maximum = 100;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
-// In this exercise, you will need to work out what num represents?
-// 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
+console.log(num);
+
+// num is a random integer between 1 and 100 (inclusive).
+// Math.random() returns a decimal in the range [0, 1).
+// Multiplying by (maximum - minimum + 1) scales it to the size of the range.
+// Math.floor(...) converts it to an integer.
+// Adding minimum shifts the range to start at 1 instead of 0.