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3v0k4/functional_explanation1.js

Last active December 21, 2019 00:07
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functional_explanation1.js
// upper :: String -> String
const upper = s => s.toUpperCase()
// shout :: String -> String
const shout = s => s.concat('!')
// format :: String => Either(String)
const format = s =>
Right(s)
.map(upper)
.map(exclame)
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