Implement isProperFraction function to determine proper fractions and add corresponding tests

Author: Darkidd77

Sprint-3/1-implement-and-rewrite-tests/implement/2-is-proper-fraction.js

@@ -12,6 +12,13 @@
 
 function isProperFraction(numerator, denominator) {
   // TODO: Implement this function
+  if (denominator === 0) {
+    return false; // A fraction with a denominator of 0 is undefined, so it's not a proper fraction.
+  }
+  if (Math.abs(numerator) < Math.abs(denominator)) {
+    return true; // A proper fraction has an absolute value of the numerator less than the absolute value of the denominator.
+  }
+  return false; // If none of the above conditions are met, it's not a proper fraction.
 }
 
 // The line below allows us to load the isProperFraction function into tests in other files.
@@ -31,3 +38,30 @@ function assertEquals(actualOutput, targetOutput) {
 
 // Example: 1/2 is a proper fraction
 assertEquals(isProperFraction(1, 2), true);
+
+// Example: -1/2 is a proper fraction
+assertEquals(isProperFraction(-1, 2), true);
+
+// Example: 1/-2 is a proper fraction
+assertEquals(isProperFraction(1, -2), true);
+
+// Example: -1/-2 is a proper fraction
+assertEquals(isProperFraction(-1, -2), true);
+
+// Example: 2/1 is not a proper fraction
+assertEquals(isProperFraction(2, 1), false);
+
+// Example: -2/1 is not a proper fraction
+assertEquals(isProperFraction(-2, 1), false);
+
+// Example: 0/1 is a proper fraction
+assertEquals(isProperFraction(0, 1), true);
+
+// Example: 1/0 is not a proper fraction (undefined)
+assertEquals(isProperFraction(1, 0), false);
+
+// Example: -1/0 is not a proper fraction (undefined)
+assertEquals(isProperFraction(-1, 0), false);
+
+// Example: 0/0 is not a proper fraction (undefined)
+assertEquals(isProperFraction(0, 0), false);