@enact/core/kind/computed.js

Enact is an open source JavaScript framework containing everything you need to create a fast, scalable mobile or web application.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = exports.computed = void 0;
/**
 * Accepts an object of computed property configurations and a property object, passes the property
 * object through each computed property handler, and merges the resulting computed properties with
 * the original properties.
 *
 * ```
 * const cfg = {
 *   sum: ({x,y,z}) => x+y+z,
 *   product: ({x,y,z}) => x*y*z
 * }
 * const props = {
 *   x: 2,
 *   y: 3,
 *   z: 4
 * }
 * computed(cfg)(props) // => {x: 2, y: 3, z: 4, sum: 9, product: 24}
 * ```
 *
 * @method computed
 * @param   {Object}    cfg  Configuration object mapping transformation functions to property names
 *
 * @returns {Function}       Function that accepts a props object and mutates it to include the
 *                           computed props
 * @private
 */
var computed = exports.computed = function computed(cfg, optProps) {
  var keys = Object.keys(cfg);
  var renderComputed = function renderComputed(props) {
    var updated = {};
    for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
      args[_key - 1] = arguments[_key];
    }
    for (var i = keys.length - 1; i >= 0; i--) {
      updated[keys[i]] = cfg[keys[i]].apply(cfg, [props].concat(args));
    }
    return Object.assign(props, updated);
  };

  // maintain compatibility with 1.x
  if (optProps) {
    return renderComputed(optProps);
  }
  return renderComputed;
};
var _default = exports["default"] = computed;