A good practice is naming variables appropriately; however, variables may be unused at times such as the timestamp from the call().
{{#include ../../../code/language/style-guide/unused_variables/src/lib.sw:unused_variable}}We may preserve the name to provide context to the reader by prepending the variable with _.
{{#include ../../../code/language/style-guide/unused_variables/src/lib.sw:named_unused_variable}}We may discard the context and the value by assigning it to _.
{{#include ../../../code/language/style-guide/unused_variables/src/lib.sw:nameless_variable}}