isFunction :: a → Boolean
Evaluates whether the given value is of type Function
import isFunction from 'deep-waters/isFunction';
const fn = () => 10;
isFunction(fn); // → true
isFunction(anythingElse); // → false
isFunction, like any other type validator, is mostly used in composed validators:
import isString from 'deep-waters/isString';
import matchesPattern from 'deep-waters/matchesPattern';
const isEmail = compose(
isFunction is built on top of ofClass validator and rely on Object.prototype.toString to check on the received value type in order to avoid typeof weird behaviours and encouraging a runtime strict type validation.