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24 lines
772 B
Ruby
24 lines
772 B
Ruby
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# frozen_string_literal: true
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module Roundable
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# To paraphrase Wikipedia, most currency pairs are quoted to four decimal
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# places. An exception to this is exchange rates with a value of less than
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# 1.000, which are quoted to five or six decimal places. Exchange rates
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# greater than around 20 are usually quoted to three decimal places and
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# exchange rates greater than 80 are quoted to two decimal places.
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# Currencies over 5000 are usually quoted with no decimal places.
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def round(value)
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if value > 5000
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value.round
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elsif value > 80
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Float(format('%.2f', value))
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elsif value > 20
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Float(format('%.3f', value))
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elsif value > 1
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Float(format('%.4f', value))
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else
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Float(format('%.5f', value))
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end
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end
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end
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