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Always default to false - Paul Grayson
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Las Vegas Ruby Group
January 29, 2014
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Always default to false - Paul Grayson
Las Vegas Ruby Group
January 29, 2014
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Transcript
Always default to false Paul Grayson Las Vegas Ruby User
Group 2014-01-29
Be opinionated! • There is a right way • Consistency
aids memory true false 1 exception 0 default
The default is already false or null in many contexts
Ruby: @var, if x, methods, [], etc. -> nil SQL: NULL Javascript: undefined C#/Java: bool/boolean defaults false Originates in digital circuits? - default is OFF
Options should be opt in ☐ YES, please add me
to your mailing list ✓
Fields, variables, conditionals # DO THIS: if on_mailing_list send_email end
# NOT THIS: if !on_mailing_list withhold_email end How would you even write that method? Body does not run by default
Be careful with true default <% if !out_of_stock %> <div
id="order_form"> ... </div> <% end %> Must remember to not put anything essential in here.
Emphasize connections def f if x exceptional_stuff else default_stuff end
more_stuff end The normal path Condition and code to handle it
true default complicates connections def f if !x default_stuff else
exceptional_stuff end more_stuff end The normal path Condition and code to handle it
The “guard clause” pattern def f return y if x
normal_stuff ... end The normal path Condition and code to handle it
Summary • Default false for all fields • Test for
unusual conditions (when possible) • Beware of conditionals with true default true false 1 exception 0 default