Golang: Ellipsis(…) operator in functions

…type is used as the final parameter in a variadic function and slice… can be passed as a parameter to the variadic function. We can also use slice… to append function that can append the slice to another.

Golang: ellipsis operator in functions summary card

Table of Contents
 
· Ellipsis in variadic functions
  ∘ “…type” as the final parameter in a variadic function
  ∘ Pass “slice…” as a parameter to the variadic function
· Ellipsis in append functions
  ∘ append “slice…” to another

Ellipsis in variadic functions

“…type” as the final parameter in a variadic function

• prefix ellipsis followed by a type
• …type behaves like a slice, []type
• If we don’t pass this parameter to the variadic function, the function will take it as an empty slice.
• … type can only be use as the final parameter in a variadic function, otherwise it will show error, “can only use … with final parameter in list”.

Pass “slice…” as a parameter to the variadic function

• a slice variable or a slice followed by suffix ellipsis
• slice… behaves like slice[0], slice[1] to slice[n]

Ellipsis in append functions

append “slice…” to another

You can access to the source code here.