code: function isValidCategoriesArray( categories ) {
  	for ( let i = 0; i < categories.length; i++ ) {
  		if ( ! isValidProductCategory( categories[ i ] ) ) {
  			// Short-circuit the loop and return now.
  			return false;
  		}
  	}
  	return true;
  }
docs: Check that all categories in a given list are valid category objects.
  
  @param  {Array} categories List of categories from the remote site API
  @return {Boolean}          True if the categories are valid.