class IRB::EvalHistory
Represents history of results of previously evaluated commands.
Available via __
variable, only if IRB.conf[:EVAL_HISTORY]
or IRB::CurrentContext().eval_history
is non-nil integer value (by default it is nil
).
Example (in ‘irb`):
# Initialize history IRB::CurrentContext().eval_history = 10 # => 10 # Perform some commands... 1 + 2 # => 3 puts 'x' # x # => nil raise RuntimeError # ...error raised # Inspect history (format is "<item number> <evaluated value>": __ # => 1 10 # 2 3 # 3 nil __[1] # => 10
Public Instance Methods
[](idx)
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Get one item of the content (both positive and negative indexes work).
# File irb/ext/eval_history.rb, line 107 def [](idx) begin if idx >= 0 @contents.find{|no, val| no == idx}[1] else @contents[idx][1] end rescue NameError nil end end