compose

compose :: [ Function ] → a → Boolean

It's the very backbone of Deep Waters, it takes a list of validators [validators][validators] (functions that accept a value and return a boolean) and returns a new function that takes a value vv and evaluates whether vv is valid for all the validators in [validators][validators].

isEmail.js
import compose from './compose';
import isString from './isString';
import matchesPattern from './matchesPattern';

const isEmail = compose(
  isString,
  matchesPattern(/^\w+([.-]?\w+)*@\w+([.-]?\w+)*(\.\w{2,3})+$/),
);

export default isEmail;

Please note, compose removes all the duplicate validators

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