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Comment by rvense | Hacker News Reader

The alternative would be something like

  l.prepend(a).append(b)

Horrible. Ghastly. Can't see anybody tolerating a language that looked like that.. /s

It gets even worse. Because Scala has infix syntax for method calls, you can do

    l prepend a append b

What? Mutating a list? DISGUSTING!

It's not mutating, its returning a new list with elements prepended and appended.

Don't know Scala but why wouldn't it be

a.append(l).append(b)

That would only work if a was itself a list..