2
For example:
defmodule Math do
def add(a \\ 2, b) do
a + b
end
end
What those two bars mean?
2
For example:
defmodule Math do
def add(a \\ 2, b) do
a + b
end
end
What those two bars mean?
2
This means a default value for the parameter passed, so in the example given, if no value is passed to the variable a
she by default will have a match with the number
2:
defmodule Math do
def add(a \\ 2, b) do
a + b
end
end
If we test the function on iex
:
iex (1)> c("math.ex")
iex (2)> Math.add(1, 8) # add/2, pois estamos fazendo o match de 1 com `a`
9
iex (3)> Math.add(8) # add/1, pois `a` está com match padrão a 2.
10
Reference to Stackoverflow Question: https://stackoverflow.com/questions/34563884/what-does-the-double-backslash-mean-in-a-function-parameter-in-elixir
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