moltres-utils/dist/data/find.js

Utils for Moltres apps

"use strict";

require("core-js/modules/es6.object.define-property");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _curry = _interopRequireDefault(require("../common/curry"));

var _defn = _interopRequireDefault(require("../common/defn"));

var _findAtIndex = _interopRequireDefault(require("./findAtIndex"));

var _isArrayLike = _interopRequireDefault(require("../lang/isArrayLike"));

var _keys = _interopRequireDefault(require("./keys"));

var _pipe = _interopRequireDefault(require("../common/pipe"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Returns the first element of the collection which matches the predicate, or
 * `undefined` if no element matches.
 *
 * Dispatches to the `find` method of the collection argument, if present.
 *
 * Supports async predicates. If a predicate returns a Promise than the entire
 * method will upgrade to async and return a Promise.
 *
 * @function
 * @since v0.0.3
 * @category data
 * @sig (a, b -> Boolean) -> [a] -> a | undefined
 * @param {Function} fn The predicate function used to determine if the element is the
 *        desired one.
 * @param {*} collection The collection to consider.
 * @returns {Object} The element found, or `undefined`.
 * @example
 *
 * const xs = [{a: 1}, {a: 2}, {a: 3}];
 * find(propEq('a', 2))(xs); //=> {a: 2}
 * find(propEq('a', 4))(xs); //=> undefined
 */
var find = (0, _curry.default)((0, _defn.default)('find', function (fn, collection) {
  if ((0, _isArrayLike.default)(collection)) {
    return (0, _findAtIndex.default)(fn, 0, collection);
  }

  return (0, _pipe.default)((0, _findAtIndex.default)(function (key) {
    return fn(collection[key], key);
  }, 0), function (key) {
    return collection[key];
  })((0, _keys.default)(collection));
}));
var _default = find;
exports.default = _default;
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