仕様書の1.1.4に
Pipelining demonstrates one way in which F# supports compositionality, a key concept in functional programming. The pipeline operator simplifies the process of writing compositional code where the result of one function is passed into the next.
ってあるんですけど、compositionalityとかcompositional codeってあまり聞いたことなくて、これって要はcomposablityとかcomposable codeってことが言いたいんでしょうか？
functional programming composabilityの検索結果: https://www.google.co.jp/search?q=functional+programming+composablity&oq=functional+programming+composablity&aqs=chrome..69i57.367j0j7&sourceid=chrome&es_sm=122&ie=UTF-8
Compositionality: the properties of interest at system level can be determined from relevant properties of its constituent components
Composability: the properties determined for individual components in isolation should hold in the face of composition with other components
という文を見つけました：http://www.ada-europe2013.org/talks/S9T2%20Baldovin.pdf
コードレベルだとComposabilityなのかもしれませんがニュアンスの違いが難しいですね
Programming F#の原著のExample3-3 Functions returns functionsで、
> // Functions returning functions
let generatePowerOfFunc baseValue =
(fun exponent -> baseValue ** exponent);;
val generatePowerOfFunc : float -> float -> float
> let powerOfTwo = generatePowerOfFunc 2.0;;
val powerOfTwo : (float -> float)
> powerOfTwo 8.0;;
val it : float = 256.0
> let powerOfThree = generatePowerOfFunc 3.0;;
val powerOfThree : (float -> float)
> powerOfThree 2.0;;
val it : float = 9.0という例があって、そこに説明として
If you look closer at our generatePowerOfFunc function, you’ll notice that its parameter
baseValue is used in the two lambdas it returned.
とありますけど、これが言っている意味(two lamdas?1個しかないように見える)が分かりません。