@wordpress/components/build-module/query-controls/terms.js

UI components for WordPress.

/**
 * External dependencies
 */
import { groupBy } from 'lodash';
/**
 * Returns terms in a tree form.
 *
 * @param {Array} flatTerms  Array of terms in flat format.
 *
 * @return {Array} Array of terms in tree format.
 */

export function buildTermsTree(flatTerms) {
  const flatTermsWithParentAndChildren = flatTerms.map(term => {
    return {
      children: [],
      parent: null,
      ...term
    };
  });
  const termsByParent = groupBy(flatTermsWithParentAndChildren, 'parent');

  if (termsByParent.null && termsByParent.null.length) {
    return flatTermsWithParentAndChildren;
  }

  const fillWithChildren = terms => {
    return terms.map(term => {
      const children = termsByParent[term.id];
      return { ...term,
        children: children && children.length ? fillWithChildren(children) : []
      };
    });
  };

  return fillWithChildren(termsByParent['0'] || []);
}
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