function set( orient ) {
	/* eslint-disable no-invalid-this */
	var err = isValid( orient );
	if ( err ) {
		throw err;
	}
	debug( 'Current value: %s.', this._orientation );

	this._orientation = orient;
	debug( 'New Value: %s.', this._orientation );

	this.emit( CHANGE_EVENT );
}
Sets the axis orientation.

@private
@param {string} orient - axis orientation
@throws {TypeError} must be a string