/**
 * Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/>
 * Build: `lodash modularize underscore exports="node" -o ./underscore/`
 * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
 * Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE>
 * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 * Available under MIT license <http://lodash.com/license>
 */

/** `Object#toString` result shortcuts */
var boolClass = '[object Boolean]';

/** Used for native method references */
var objectProto = Object.prototype;

/** Used to resolve the internal [[Class]] of values */
var toString = objectProto.toString;

/**
 * Checks if `value` is a boolean value.
 *
 * @static
 * @memberOf _
 * @category Objects
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if the `value` is a boolean value, else `false`.
 * @example
 *
 * _.isBoolean(null);
 * // => false
 */
function isBoolean(value) {
  return value === true || value === false ||
    value && typeof value == 'object' && toString.call(value) == boolClass || false;
}

module.exports = isBoolean;
