Covering some basic topics I haven't seen elsewhere on Cody.
Return the class of the input variable.
letter yes yes & letter no no
Determine Whether an array is empty
Compute a dot product of two vectors x and y
Rotate a Matrix by 90 degrees
Create matrix of replicated elements
Back to basics 11 - Max Integer
Back to basics 21 - Matrix replicating
Back to basics 4 - Search Path
Back to basics 7 - Equal NaNs
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