shapey/combine.js

A simple syntax for remapping objects, inspired by several of Ramda's spec based functions

"use strict";

exports.__esModule = true;
exports.default = void 0;

var _curry = _interopRequireDefault(require("vanillas/curry"));

var _flatten = _interopRequireDefault(require("vanillas/flatten"));

var _isObject = _interopRequireDefault(require("vanillas/isObject"));

var _merge = _interopRequireDefault(require("vanillas/merge"));

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

/**
 * Combines two values of the same type (if it makes sense to combine them).
 * Numbers are summarized, strings and arrays are concatenated together, and true objects are merged (the second value merged on top of the first).
 * In any other case only the first value is returned.
 *
 * @function
 * @name combine
 * @sig a -> a -> a
 * @param {*} val1 The base value to be combined with
 * @param {*} val2 The value to combine
 * @returns {*} If the values are of the same type, this represents the combined value of the two of them. Otherwise only the first value is returned
 */
var _default = (0, _curry.default)(function (val1, val2) {
  if (typeof val1 === 'number' && typeof val2 === 'number') {
    return val1 + val2;
  } else if (typeof val1 === 'string' && typeof val2 === 'string') {
    return [val1, val2].join('');
  } else if (Array.isArray(val1) && Array.isArray(val2)) {
    return (0, _flatten.default)([val1, val2]);
  } else if ((0, _isObject.default)(val1) && (0, _isObject.default)(val2)) {
    return (0, _merge.default)(val1, val2);
  } else {
    return val1;
  }
});

exports.default = _default;
module.exports = exports.default;