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rawpatchinlineside by side (parent: 791631a)
rawpatchinlineside by side (parent: 791631a)
| author | Jun Hiroe <[email protected]> | |
| Sun, 20 Apr 2014 16:35:00 +0000 (21 01:35 +0900) | ||
| committer | Jun Hiroe <[email protected]> | |
| Sun, 20 Apr 2014 16:40:39 +0000 (21 01:40 +0900) |
| mrbgems/mruby-array-ext/mrblib/array.rb | patchblobblamehistory | |
| mrbgems/mruby-array-ext/test/array.rb | patchblobblamehistory |
def rotate!(count=1)
self.replace(self.rotate(count))
end
+
+ ##
+ # call-seq:
+ # ary.delete_if { |item| block } -> ary
+ # ary.delete_if -> Enumerator
+ #
+ # Deletes every element of +self+ for which block evaluates to +true+.
+ #
+ # The array is changed instantly every time the block is called, not after
+ # the iteration is over.
+ #
+ # See also Array#reject!
+ #
+ # If no block is given, an Enumerator is returned instead.
+ #
+ # scores = [ 97, 42, 75 ]
+ # scores.delete_if {|score| score < 80 } #=> [97]
+
+ def delete_if(&block)
+ return to_enum :delete_if unless block_given?
+
+ idx = 0
+ while idx < self.size do
+ if block.call(self[idx])
+ self.delete_at(idx)
+ else
+ idx += 1
+ end
+ end
+ self
+ end
end
assert_equal ["c", "d", "a", "b"], a.rotate(10)
assert_equal [], [].rotate!
end
+
+assert("Array#delete_if") do
+ a = [1, 2, 3, 4, 5]
+ assert_equal [1, 2, 3, 4, 5], a.delete_if { false }
+ assert_equal [1, 2, 3, 4, 5], a
+
+ a = [1, 2, 3, 4, 5]
+ assert_equal [], a.delete_if { true }
+ assert_equal [], a
+
+ a = [1, 2, 3, 4, 5]
+ assert_equal [1, 2, 3], a.delete_if { |i| i > 3 }
+ assert_equal [1, 2, 3], a
+end