throw.swift

// What's the best syntax for this:

// no trailing-closures
// explicit about what's happening, but those ()'s aren't needed... can we do better?

throwActions.filter({ $0.direction == dir }).map({ $0.action() })

// all trailing closures
// weirdly looks like we're mapping the block, rather than the result of filtering throwActions using that block.

throwActions.filter { $0.direction == dir }.map { $0.action() }

// only trailing-closure syntax on the *trailing* closure?
// weird to mix and match syntax, but at least it's clearer what we're mapping

throwActions.filter({ $0.direction == dir }).map { $0.action() }

// all trailing, each on it's own line
// not bad... very javascript-y. Suggested by @JohnRHeaton when I asked about this on Twitter

throwActions
    .filter { $0.direction == dir }
    .map { $0.action() }
    
// don't chain functions
// is this too explicit? It means we have to come up with names for any/all intermediate steps.

let filteredActions = throwActions.filter { $0.direction == dir }
filteredActions.map { $0.action() }