rameshkumar
Inconsistent Enum.map output
Hi, I’m a little dumbfounded with the following iex session that I ran:
iex(7)> Enum.map([4,5,6], &(2 * &1))
'\b\n\f'
iex(8)> Enum.map([1,5,6], &(2 * &1))
[2, 10, 12]
iex(9)> Enum.map([1,2,3], &(2 * &1))
[2, 4, 6]
iex(10)> Enum.map([7,8,9], &(2 * &1))
[14, 16, 18]
iex(11)> Enum.map([4,5,6,7], &(2 * &1))
[8, 10, 12, 14]
iex(12)>
What is special about the list [4,5,6] (see first two lines of code and its output) that the output is entirely different in meaning from the rest? What am I failing to understand here?
Any ideas?
Thank you.
Marked As Solved
chulkilee
[8, 10, 12] == '\b\n\f'
So the value is correct. What’s surprising (to you) is how iex (actually IO.inspect/2 behind the scene) shows the list in that format.
That is because iex treat it as charlist (note it’s with single quote, not double quote)
- https://elixir-lang.org/getting-started/binaries-strings-and-char-lists.html
- https://stackoverflow.com/questions/30037914/elixir-lists-interpreted-as-char-lists
IO.inspect([8, 10, 12])
IO.inspect([8, 10, 12], charlists: :as_lists)
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