Input(s) - any string
Output(n) - number of digits within string s
Additional test cases have been added.
Back to basics 13 - Input variables
Return elements unique to either input
matrix of natural number
Is it an Armstrong number?
Concatenate two strings
Can I make a right triangle ?
Mean and standard deviation of times in string
Vector of numbers divisible by 3
Volume and area of a sphere
Make a vector of prime numbers
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