[Functional Programming] propSatisfies with implies
// implies :: ((a -> Boolean), (a -> Boolean)) -> a -> Boolean
const implies = (p, q) =>
ifElse(
p,
compose(
Boolean,
q
),
constant(true)
); // hasLEngth :: a -> Boolean
const hasLength = compose(
Boolean,
length
);
// isLarge :: a -> Boolean
const isLarge = propSatisfies(flip(gt, 3), "length");
const arrayWithLength = implies(isArray, hasLength);
const isLargeString = implies(isString, isLarge); /**
* isValidStringOrArray is week can check array has length
* or string is large, only for those two types
* other types, such as number, objet, it return false
*/
const isValidStringOrArray = allPass([
or(isString, isArray),
arrayWithLength,
isLargeString
]); log(isLargeString(undefined)); // true
log(arrayWithLength(undefined)); // true
log(isValidStringOrArray(undefined)); // false
log(isValidStringOrArray({})); // false
log(isValidStringOrArray([1, 2])); // true
log(isValidStringOrArray("fwe")); // false
log(isValidStringOrArray("fwef")); // true
Crocks.js has the implementation, no need to do it yourself.
https://evilsoft.github.io/crocks/docs/functions/logic-functions.html#implies
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