@servicenow/ui-renderer-snabbdom/module/utils/formatChildren.js

Snabbdom renderer for UI Framework on Next Experience

/**
 * Copyright (c) 2020 ServiceNow, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *  
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *  
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/**
 * Formats children to be rendered by snabbdom
 * - recursively flatten + compact arrays
 * - filter out boolean/Symbol values (snabbdom throws on these)
 */
function recurse(arr, result) {
  const {
    length
  } = arr;

  for (let i = 0; i < length; i++) {
    const item = arr[i];
    if (Array.isArray(item)) recurse(item, result);else if (typeof item !== 'boolean' && typeof item !== 'symbol' && item !== null && item !== undefined) result.push(item);
  }

  return result;
}

export default function formatChildren(arr) {
  return recurse(arr, []);
}
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