lodash/internal/baseMatches.js

define(['./baseIsMatch', '../utility/constant', './isStrictComparable', '../object/keys', './toObject'], function(baseIsMatch, constant, isStrictComparable, keys, toObject) {

  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
  var undefined;

  /**
   * The base implementation of `_.matches` which does not clone `source`.
   *
   * @private
   * @param {Object} source The object of property values to match.
   * @returns {Function} Returns the new function.
   */
  function baseMatches(source) {
    var props = keys(source),
        length = props.length;

    if (!length) {
      return constant(true);
    }
    if (length == 1) {
      var key = props[0],
          value = source[key];

      if (isStrictComparable(value)) {
        return function(object) {
          if (object == null) {
            return false;
          }
          return object[key] === value && (value !== undefined || (key in toObject(object)));
        };
      }
    }
    var values = Array(length),
        strictCompareFlags = Array(length);

    while (length--) {
      value = source[props[length]];
      values[length] = value;
      strictCompareFlags[length] = isStrictComparable(value);
    }
    return function(object) {
      return object != null && baseIsMatch(toObject(object), props, values, strictCompareFlags);
    };
  }

  return baseMatches;
});