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evilsoft/usingPred.js

Last active February 13, 2017 17:12
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usingPred.js
const { Pred, mconcat, isArray, not, isEmpty, safe } = require('crocks')
const pred =
mconcat(Pred, [ not(isEmpty), isArray ])
// maybeArray : a -> Maybe []
const maybeArray =
safe(pred)
console.log(maybeArray([ 1, 2 ])) // Just [ 1, 2 ]
console.log(maybeArray([])) // Nothing
console.log(maybeArray({})) // Nothing
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