From: cremno@... Date: 2016-05-05T14:46:51+00:00 Subject: [ruby-core:75371] [Ruby trunk Feature#12350] Introduce Array#find! that raises an error if element not found Issue #12350 has been updated by cremno phobia. You can pass a callable object to `Enumerable#find`: ~~~ruby def find_price!(size) prices.find(->{ fail "Price for #{size} not found" }){ |p| p.key == size } end ~~~ ---------------------------------------- Feature #12350: Introduce Array#find! that raises an error if element not found https://bugs.ruby-lang.org/issues/12350#change-58496 * Author: Andrey Koleshko * Status: Open * Priority: Normal * Assignee: ---------------------------------------- It would be great to have some function (like `Hash#fetch`) for `Array` that raises an exception if element not found by passed block in `find`. For example: ~~~ [].find! { |el| el == 1 } => ElementError: element not found ~~~ I just noticed that there are many cases when it's needed to raise an exception (because this is exceptional situation) if an element not found. Currently I just define methods like this one: ~~~ def find_price!(size) found_price = prices.find { |p| p.key == size } fail "Price for #{size} not found" unless found_price found_price end ~~~ -- https://bugs.ruby-lang.org/ Unsubscribe: