not

not :: Function → a → Boolean

Takes a function $f$ , and returns a new one receiving a value $val$ and returning the opposite of what $f(val)$ would have returned.

It is largely used within the library itself.

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),
);

Related validators

composewhenor