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kylecorbelli/safe-head-example-reworked.ts

Last active May 1, 2018 14:33
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safe-head-example-reworked.ts
type UpperCaseHead = (list: ReadonlyArray<string>) => Maybe<string>
const upperCaseHead: UpperCaseHead = compose(
Maybe.map(toUpper),
safeHead,
) as UpperCaseHead
console.log(upperCaseHead([])) // { type: Maybe.Nothing } ie. Nothing
console.log(upperCaseHead([ 'rick', 'morty' ])) // { type: Maybe.Just, value: 'RICK' } ie. Just 'RICK'
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