Handling CRUD Permissions via bitwise operations

CRUDPermissions.js

// Crud Permissions

function CRUDPermissions () {

    var self = this;

    self.CREATE = 8, 
    self.READ = 4, 
    self.UPDATE = 2, 
    self.DELETE = 1, 
    self.perm = 0;

    self.readPerm = action => (self.perm & action) == action;
    self.givePerm = action => self.perm = (self.perm | action);
    self.removePerm = action => self.perm = (self.perm & ~action);

}

/*
var t = new CRUDPermissions();

t.givePerm(t.CREATE); // 8

t.readPerm(t.CREATE); // true

t.removePerm(t.CREATE); // 0

t.readPerm(t.CREATE); // false
*/