when
when :: (Function, Function) → Function → Boolean
Takes two validators, the
validator and the
validator, then returns a new function receiving a value
(of any type) and execute the
validator only when the
returns true.
It is largely used within the library itself to evaluate certain conditions:
contains.js
/* Part of the contains validator */
const contains = (value) => compose(
when(isString, (string) => string.includes(value)),
when(Array.isArray, arrayContains(value)),
when(not(or(isString, Array.isArray)), stubFalse),
);
Last modified 2yr ago