Guess the formula to transform strings as follows:
'Hello World!' --> 'Ifmmp Xpsme!'
'Can I help you?' --> 'Dbo J ifmq zpv?'
Simple and interesting.
Implement a ROT13 cipher
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Change the sign of even index entries of the reversed vector
Magic is simple (for beginners)
Apply a function array to an array of numbers
Replace multiples of 5 with NaN
Flexible Anonymous Function
Create an 'arrow-head" matrix
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