merge: Absolute value (#866)

Maths/Abs.js

@@ -1,14 +1,12 @@
-/*
-    author: PatOnTheBack
-    license: GPL-3.0 or later
-
-    Modified from:
-        https://github.com/TheAlgorithms/Python/blob/master/maths/abs.py
-
-    This script will find the absolute value of a number.
-
-    More about absolute values:
-        https://en.wikipedia.org/wiki/Absolute_value
+/**
+ * @function absVal
+ * @description This script will find the absolute value of a number.
+ * @param {Integer} num - The input integer
+ * @return {Integer} - Absolute number of num.
+ * @see [Absolute_value](https://en.wikipedia.org/wiki/Absolute_value)
+ * @example absVal(-10) = 10
+ * @example absVal(50) = 50
+ * @example absVal(0) = 0
  */
 
 const absVal = (num) => {

Maths/test/Abs.test.js

@@ -10,4 +10,9 @@ describe('absVal', () => {
     const absOfPositiveNumber = absVal(50)
     expect(absOfPositiveNumber).toBe(50)
   })
+
+  it('should return an absolute value of a zero number', () => {
+    const absOfPositiveNumber = absVal(0)
+    expect(absOfPositiveNumber).toBe(0)
+  })
 })