feat(day 3): add fibonacci sequence generator with dynamic starting values

Author: JohnSunny21

FreeCodeCamp/CodingQ/fiboSequence.py

@@ -0,0 +1,35 @@
+"""
+Fibonacci Sequence
+The Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones.
+When starting with 0 and 1, the first 10 numbers in the sequence are 0, 1, 1, 2, 3, 5, 8, 13, 21, 34.
+
+Given an array containing the first two numbers of a Fibonacci sequence, and an integer representing 
+the length of the sequence, return an array containing the sequence of the given length.
+
+Your function should handle sequences of any length greater than or equal to zero.
+If the length is zero, return an empty array.
+Note that the starting numbers are part of the sequence.
+===================================================================================
+O/P ==============>
+
+1. fibonacci_sequence([0, 1], 20) should return [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181].
+2. fibonacci_sequence([21, 32], 1) should return [21].
+"""
+
+def fibonacci_sequence(start_sequence,length):
+
+    if length == 0:
+        return []
+    if length == 1:
+        return [start_sequence[0]]
+    if length == 2:
+        return start_sequence[:2]
+    
+    result = start_sequence[:2]
+    while len(result) < length:
+        result.append(result[-1] + result[-2])
+    return result
+
+
+if __name__ == "__main__":
+    print(fibonacci_sequence([0, 1], 20)) 

FreeCodeCamp/CodingQ/fiboSequenceTest.py

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+import unittest
+from fiboSequence import fibonacci_sequence
+
+
+class fiboSequenceTest(unittest.TestCase):
+
+    def test1(self):
+        self.assertEqual(fibonacci_sequence([0, 1], 20),[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181])
+
+    def test2(self):
+        self.assertEqual(fibonacci_sequence([21, 32], 1),[21])
+
+    def test3(self):
+        self.assertEqual(fibonacci_sequence([0, 1], 0),[])
+
+    def test4(self):
+        self.assertEqual(fibonacci_sequence([10, 20], 2),[10,20])
+
+    def test5(self):
+        self.assertEqual(fibonacci_sequence([123456789, 987654321], 5),[123456789, 987654321, 1111111110, 2098765431, 3209876541])
+
+
+if __name__ == "__main__":
+    unittest.main()