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Filename : index.js
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'use strict';

var typeOf = require('kind-of');

/**
 * Basic sort algorithm that has similar behavior to `Array.prototype.sort`
 * for null and undefined, but also allows sorting by an object property.
 *
 * @param {Mixed} `a` First value to compare.
 * @param {Mixed} `b` Second value to compare.
 * @param {String} `prop` Optional property to use when comparing objects. If specified must be a string.
 * @return {Number} Returns 1 when `a` should come after `b`, -1 when `a` should come before `b`, and 0 when `a` and `b` are equal.
 * @api public
 */

module.exports = function defaultCompare(a, b, prop) {
  if (prop != null && typeOf(prop) !== 'string') {
    throw new TypeError('expected "prop" to be undefined or a string');
  }

  var typeA = typeOf(a);
  var typeB = typeOf(b);

  if (prop) {
    if (typeA === 'object') {
      a = a[prop];
      typeA = typeOf(a);
    }
    if (typeB === 'object') {
      b = b[prop];
      typeB = typeOf(b);
    }
  }

  if (typeA === 'null') {
    return typeB === 'null' ? 0 : (typeB === 'undefined' ? -1 : 1);
  } else if (typeA === 'undefined') {
    return typeB === 'null' ? 1 : (typeB === 'undefined' ? 0 : 1);
  } else if (typeB === 'null' || typeB === 'undefined') {
    return -1;
  } else {
    return a < b ? -1 : (a > b ? 1 : 0);
  }
};