The main purpose is to bring attention to `flip map`, which improves code readablity. It is useful when ad-hoc anonymous function grows two or more lines in `map` application: ``` map (lcfg: let port = lcfg.port; portStr = if port != defaultPort then ":${toString port}" else ""; scheme = if cfg.enableSSL then "https" else "http"; in "${scheme}://cfg.hostName${portStr}" ) (getListen cfg); ``` Compare this to `foreach`-style: ``` foreach (getListen cfg) (lcfg: let port = lcfg.port; portStr = if port != defaultPort then ":${toString port}" else ""; scheme = if cfg.enableSSL then "https" else "http"; in "${scheme}://cfg.hostName${portStr}" ); ``` This is similar to Haskell's `for` (http://hackage.haskell.org/package/base-4.12.0.0/docs/Data-Traversable.html#v:for)wip/yesman
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