Question whether given string is empty or contains only of space characters
string:is_blank?(STRING $string) : BOOL
string:is_blank?(' ')
#=> TRUE
string:is_blank?('')
#=> TRUE
string:is_blank?(' abc ')
#=> FALSE
string:is_blank?("\n")
#=> TRUE
# tabs, newlines and other characters are considered blank characters
string:is_blank?("\t\n")
#=> TRUE
string:is_blank?("\nhi\t\n")
#=> FALSE
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