how come i can't do list.forEach(println) and i have to do list.forEach(::println)?

# getting-started

[johnfn]

how come i can't do list.forEach(println) and i have to do list.forEach(::println)?

[Mike]

The first is calling a function, so you have to give it a parameter.
list.forEach(println(it)) will work.

The second is passing a function reference. The function (println) takes one parameter.

forEach takes a Lamda/function that accepts one parameter. So it is coded such that it calls the function with its parameter for you.

HTH