While installing and browsing the awesome_print gem, I noticed in the examples this little beauty:
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| require "awesome_print"
> ap (''.methods - Object.methods).grep(/!/)
[
[ 0] capitalize!() String
[ 1] chomp!(*arg1) String
[ 2] chop!() String
[ 3] delete!(*arg1) String
[ 4] downcase!() String
[ 5] encode!(*arg1) String
[ 6] gsub!(*arg1) String
[ 7] indent!(amount, *indent_string, *indent_empty_lines) String
[ 8] lstrip!() String
[ 9] next!() String
[10] read_ber!(*syntax) String (Net::BER::Extensions::String)
[11] remove!(pattern) String
[12] reverse!() String
[13] rstrip!() String
[14] slice!(*arg1) String
[15] squeeze!(*arg1) String
[16] squish!() String
[17] strip!() String
[18] sub!(*arg1) String
[19] succ!() String
[20] swapcase!() String
[21] tr!(arg1, arg2) String
[22] tr_s!(arg1, arg2) String
[23] upcase!() String
]
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