Do & Don’t — Length of Range — Elixir

Calculating the length of range

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iex> range = 1..100000000

DON’T ❌

iex> range |> Enum.to_list |> length
100000000

It takes a few seconds to give you the result and it’s a bad idea.

DO ✔️

The following code statements would results in no time.

iex> range |> Enum.count
100000000

Here,Enum.count will do pattern matching over range to extract the boundaries of the range and perform simple arithmetic operation.

iex> min..max = range
iex> max -min + 1
100000000

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