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when

when :: (Function, Function) → Function → Boolean
Takes two validators, the
conditioncondition
validator and the
fnfn
validator, then returns a new function receiving a value
vv
(of any type) and execute the
fnfn
validator only when the
condition(v)condition(v)
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),
);
​
​