ListToCsv.Key.replace_first

You're seeing just the function replace_first, go back to ListToCsv.Key module for more information.
Link to this function

replace_first(list, from, to)

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Returns a new list created by replacing occurrences of pattern in subject with replacement. Only the first occurrence is replaced.

Examples

iex> replace_first([:item, :N, :name], :N, 1)
[:item, 1, :name]

iex> replace_first([:item, :N, :name, :N], :N, 2)
[:item, 2, :name, :N]