utils.js

/*
  Utilities functions and polyfills
 */
export function entries (obj) {
  return 'entries' in Object ? Object.entries(obj) : Object.keys(obj).map((prop) => [prop, obj[prop]]);
}

export function areEqual (val1, val2) {
  if ((val1 === 0 || val2 === 0) && val1 === val2) return true;
  else if (!val1 || !val2 || typeof val1 !== typeof val2) return false;
  else if (typeof val1 === 'string' || typeof val1 === 'number' || typeof val1 === 'boolean') return val1 === val2;
  else if (typeof val1 === 'object') {
    return (
      Object.keys(val1).length === Object.keys(val2).length &&
      entries(val2).every(([key2, value2]) => val1[key2] === value2)
    );
  }
}

// Counts nodes with non-null value property without optgroups
// noinspection JSMethodCanBeStatic
export function getChildrenLength (children) {
  if (!children) return 0;
  else if (Array.isArray(children) && children.length) {
    return children.reduce((count, { type, props: { value, children: cpc } }) => {
      if (type === 'optgroup') {
        if (cpc) {
          if (Array.isArray(cpc)) {
            for (const c of cpc) {
              if (c.props.value) ++count;
            }
          } else if (typeof cpc === 'object' && cpc.props.value) ++count;
        }
      } else if (value || value === 0) ++count;
      return count;
    }, 0);
  } else if (!Array.isArray(children) && typeof children === 'object') {
    if (children.type === 'optgroup') return getChildrenLength(children.props.children);
    else if (children.props.value) return 1;
  }
  return 0;
}

// In multiple mode, this function checks for values missing the required 'value' prop
export function checkFormat (value) {
  return value.findIndex((v) => typeof v !== 'object' || !('value' in v));
}