isBoolean

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isBoolean

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

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