What are pipelines in Elixir?
Similar to the pipe operator in Unix, the pipe operator takes the return value from the expression on its left and provides it as the first parameter to the function call on its right.
The pipe operator is denoted by |> in Elixir.
Code example
Let’s understand the pipeline with an example.
Consider that the following operations have to be performed on a given string:
- Remove leading and trailing spaces
- Convert only the first character of the string to uppercase
- Concat another string with it
The above three operations can be performed in different steps as different expressions, with the result of each step stored in a temporary variable.
We can also perform the sequence of the above operations via a pipe operator.
Let’s see the following code:
platform = " The educative platform "IO.puts(["Original string - ", platform])temp = String.trim(platform)temp = String.capitalize(temp)temp = String.split(temp, " ")IO.puts "Final string - "IO.inspect tempIO.puts "-----------"IO.puts "Using pipe operator"new_temp = platform |> String.trim() |> String.capitalize() |> String.split(" ")IO.inspect new_temp
Code explanation
- Line 1: A
stringis defined. - Line 5: The
trim()function is applied and the result is stored in thetempvariable. - Line 7: The
capitalize()function is applied and the result is stored in thetempvariable. - Line 9: The
split()function is applied and the result is stored in thetempvariable. - Line 17: We can combine
stringsin lines 5,7, and 9 as a single expression using the pipe operator.
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