lodash/internal/baseMatches.js

import baseIsMatch from './baseIsMatch';
import constant from '../utility/constant';
import isStrictComparable from './isStrictComparable';
import keys from '../object/keys';
import toObject from './toObject';

/**
 * 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) {
        return object != null && object[key] === value &&
          (typeof 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);
  };
}

export default baseMatches;