Today I Learned

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Ins And Outs Of Pry

When executing commands during a Pry session, you'll see an incrementing number for each prompt as you enter each statement. These numbers can be used to look up the inputs and outputs of each statement executed during the session. The statements and their results are made available in the array-like _in_ and _out_ objects.

[1] pry(main)> :one
=> :one
[2] pry(main)> 1 + 1
=> 2
[3] pry(main)> ["t", "h", "r", "e", "e"].join
=> "three"
[4] pry(main)> _in_.to_a
=> [nil, ":one\n", "1 + 1\n", "[\"t\", \"h\", \"r\", \"e\", \"e\"].join\n"]
[5] pry(main)> _out_.to_a
=> [nil, :one, 2, "three", [nil, ":one\n", "1 + 1\n", "[\"t\", \"h\", \"r\", \"e\", \"e\"].join\n"]]
[6] pry(main)> _out_[2]
=> 2
[7] pry(main)> _in_[2]
=> "1 + 1\n"

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