Alright time for an exercise in both Python and JavaScript again! Today I’m doing Fibonacci numbers 🙂
Exercise: Fibonacci Sequence Generator
Objective: Write a program in both Python and JavaScript that generates and prints the first n
numbers of the Fibonacci sequence. The Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones, usually starting with 0 and 1.
Requirements:

Input: Your program should take an integer
n
as input, which represents the number of Fibonacci numbers to generate. 
Output: Your program should output the first
n
numbers of the Fibonacci sequence, each number printed on a new line. 
Validation: Include input validation to ensure
n
is a nonnegative integer. If the input is invalid, your program should print a friendly error message. 
Efficiency: (Optional) Implement your solution efficiently to handle larger values of
n
gracefully.
My Code
Here my Python
def main():
while True:
try:
user_input = int(input('n: '))
if user_input <= 0:
print('Please enter a positive number')
else:
break
except ValueError:
print('Please enter a number')
fibonacci = 1
helper = 0
print('0')
for _ in range(user_input  1):
print(fibonacci)
new_fibonacci = fibonacci + helper
helper = fibonacci
fibonacci = new_fibonacci
if __name__ == '__main__':
main()
And next my JavaScript, with browser interface!
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF8">
<meta name="viewport" content="width=devicewidth, initialscale=1.0">
<title>Exercise: Fibonacci Sequence Generator</title>
</head>
<body>
<input id="jsinput" type="number">
<button id="jsgeneratebutton">generate</button>
<p id="jsoutput"></p>
<script>
function makeFibonacci(number) {
let array = [0]
let fibonacci = 1
let helper = 0
let new_fibonacci = 0
for (let i = number; i > 0; i) {
array.push(fibonacci)
new_fibonacci = fibonacci + helper
helper = fibonacci
fibonacci = new_fibonacci
}
return array
}
document.getElementById('jsgeneratebutton').onclick = function () {
user_input = document.getElementById('jsinput').value;
output = makeFibonacci(user_input)
document.getElementById('jsoutput').textContent = output;
}
</script>
</body>
</html>
Ohly thing I had to look up here is .push()
. I should remember that by now. Also the output isn’t really pretty but I’ll work more on that another day
have a great way everyone!
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