33 lines
856 B
Ruby
33 lines
856 B
Ruby
module Gitlab
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module Metrics
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# Class for calculating the difference between two numeric values.
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#
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# Every call to `compared_with` updates the internal value. This makes it
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# possible to use a single Delta instance to calculate the delta over time
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# of an ever increasing number.
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#
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# Example usage:
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#
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# delta = Delta.new(0)
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#
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# delta.compared_with(10) # => 10
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# delta.compared_with(15) # => 5
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# delta.compared_with(20) # => 5
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class Delta
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def initialize(value = 0)
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@value = value
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end
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# new_value - The value to compare with as a Numeric.
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#
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# Returns a new Numeric (depending on the type of `new_value`).
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def compared_with(new_value)
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delta = new_value - @value
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@value = new_value
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delta
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end
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end
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end
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end
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