gistfile1.swift

// As an example, let's look at a reduction that creates a total sum 
// of an array of Floats with a different approaches, all with the same outcome:

let total: [Float] -> Float = { $0.reduce(0, combine: +) }

let total = transactions.reduce(0, {$0 + $1})

// It's easy to swap out operators to make it a multiplication, division, 
// or some other custom block execution. 
// Here we want to know if an entire list of booleans is true:

let all_or_nothing: [Bool] -> Bool = { 
  $0.reduce(true, combine: { $0 && $1 }
}