When writing code in Julia, it is often necessary to call functions that return a value. However, there may be cases where the return value is not needed or used in the subsequent code. In such cases, it is possible to annotate the function call to indicate that the return value should be elided.
Option 1: Assigning to an underscore variable
One way to elide the return value of a function call is to assign it to an underscore variable. In Julia, the underscore variable is a convention used to indicate that the value is not used. By assigning the return value to an underscore variable, it effectively discards the value.
_ = function_call()
This option is simple and straightforward. However, it may not be the most readable or intuitive solution, especially for someone who is not familiar with the convention of using an underscore variable to indicate a discarded value.
Option 2: Using the `do` block syntax
Another way to elide the return value of a function call is to use the `do` block syntax. This syntax allows you to call a function and specify what to do with the return value within the block. By not specifying any action within the block, the return value is effectively discarded.
function_call() do _
# do nothing with the return value
end
This option provides more clarity and readability compared to assigning to an underscore variable. The `do` block syntax explicitly indicates that the return value is not used, making it easier for others to understand the intention of the code.
Option 3: Using the `@ignore` macro
A third option to elide the return value of a function call is to use the `@ignore` macro. This macro is specifically designed to discard the return value of a function call. By wrapping the function call with the `@ignore` macro, the return value is automatically discarded.
@ignore function_call()
This option provides the most concise and expressive solution. The `@ignore` macro clearly indicates the intention to discard the return value, making the code more readable and self-explanatory.
After considering the three options, the best choice depends on the specific context and the preferences of the developer. Option 1 is the simplest, but may not be the most intuitive. Option 2 provides more clarity and readability. Option 3 offers the most concise and expressive solution. Ultimately, it is recommended to choose the option that best suits the coding style and maintainability of the project.
