isBoolean :: a → Boolean
Evaluates whether the given value is of type Boolean
import isBoolean from 'deep-waters/isBoolean';
isBoolean(true); // → true
isBoolean(false); // → true
isBoolean(new Boolean(true)); // → true
isBigInt(20); // → false
isBigInt("hello"); // → false
isBigInt(undefined"); // → false
isBoolean, 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(
isBoolean 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.