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Add or() to get a default value when given value is null or undefined

This is a safe alternative to the common idiom
  a = a || b
which is error prone with boolean values (a=false), numbers (a=0)
and strings (a="").
Remove empty line at end of files

A new line (without an extra empty line followed with a new line)
is sufficient.
Add space characters around modulo operator
Add find() function to find the first item matching a criterion