45 lines
721 B
Crystal
45 lines
721 B
Crystal
module Enumerable(T)
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def count_each(others)
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count_map = {} of T => Int32
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each do |other|
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count_map[other] = (count_map[other]? || 0) + 1
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end
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return count_map
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end
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end
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class Rectangle
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def initialize(@x : Int32, @y : Int32, @width : Int32, @height : Int32)
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end
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def each_coord(&block)
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(@x...(@x + @width)).each do |x|
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(@y...(@y + @height)).each do |y|
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yield x, y
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end
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end
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end
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end
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class String
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def select(&block)
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String.build do |s|
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each_char do |c|
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s << c if yield c
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end
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end
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end
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def select!(&block)
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i = 0
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s = size
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while i < s
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if yield [i]
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i += 1
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else
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s -= 1
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end
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end
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end
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end
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