How to use the network/StatusCode.OK function in network

readUserPermissionsCallback = (statusCode, response) => {
        switch (statusCode) {
        case StatusCode.OK:
            // console.log('---------------------')
            // console.log(response)

            var permissionKeyArray = [];

            response.forEach((adminPermission) => {
                var key = adminPermission.permission.key;
                permissionKeyArray.push(key);
            });

            // console.log(permissionKeyArray)
            this.setState({ permissionKeyArray: permissionKeyArray });
            break;
        case StatusCode.NOT_FOUND:
            break;
        default:

readUsersCallback = (statusCode, response) => {
        switch (statusCode) {
        case StatusCode.OK:
            this.setState({
                totalItemCount: response.count,
                users: response.rows
            })
            break
        default:
            alert(response.msg)
            break
        }
    }

updateUserLayoutCallback = (statusCode, response) => {
        switch (statusCode) {
        case StatusCode.OK:
            break;
        default:
            alert(response.msg);
            break;
        }
    }