33 lines
669 B
Elixir
33 lines
669 B
Elixir
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defmodule NucleotideCount do
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@nucleotides [?A, ?C, ?G, ?T]
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@doc """
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Counts individual nucleotides in a DNA strand.
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## Examples
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iex> NucleotideCount.count('AATAA', ?A)
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4
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iex> NucleotideCount.count('AATAA', ?T)
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1
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"""
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@spec count([char], char) :: non_neg_integer
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def count(strand, nucleotide) do
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Enum.count(strand, fn n -> n == nucleotide end)
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end
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@doc """
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Returns a summary of counts by nucleotide.
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## Examples
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iex> NucleotideCount.histogram('AATAA')
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%{?A => 4, ?T => 1, ?C => 0, ?G => 0}
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"""
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@spec histogram([char]) :: map
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def histogram(strand) do
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Map.new(@nucleotides, fn n -> {n, count(strand, n)} end)
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end
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end
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