typescript enum bitmasks

bitmasks.ts

https://www.typescriptlang.org/play?#code/PTAEGUFMGcAsEMDGCA28C2oC0oAuBPABxkQCcBLQ3UAI3N3XmgGtoBYAKE8gDsBXTAGEASgFUAIqADenUHNCDSkeLkigAvKACMoADy7QABgA0s+cOUATDdr0GtpjvNCjCllWs079oAEyPncUgUSFUbbwMAZkcAX05ORAB7HmhqAEEUFBEJAHkqcmToG2zxADpFZTCAHwUxMot4axqS0td3atqJUqCQ1QBueI4klMSQ0pREgHMACgysurzcApSASgGuIcLqeEzEgHdLReWizQBtFoqPY06yto8AXXXOXtp6E6N1gDNE0lBp4dSoESQM+oB2EwOR0KK2kZjkdFwRSqmkS6ziGwBo0g4ym0wR0DWg0xYwmMzxb1AADIbuUlB4YepGTTLqpCZsRiTceTEVSaXdWRomS1+ZA2Zx8VTNAA-YVuDxPdnQLE4mb4sWK5Wk6bcorUi50gWMzT6yqi9bE7FanW82XtUWC411Vpy1nrIA

// Seshachalam - typescript bitmasks

enum CRUD {
    Create = 1 << 0,
    Read = 1 << 1,
    Update = 1 << 2,
    Delete = 1 << 3,
}

const AllCRUDOptions = CRUD.Create | CRUD.Read | CRUD.Update | CRUD.Delete;

console.log(AllCRUDOptions);

const allowdOptions = [CRUD.Create, CRUD.Update];

let bits = 0;
for (const o of allowdOptions) {
    bits |= o;
}

console.log(bits);

console.log((bits & CRUD.Create) === CRUD.Create);
console.log((bits & CRUD.Update) === CRUD.Update);

bits &= ~CRUD.Update;

console.log(bits);

console.log((bits & CRUD.Create) === CRUD.Create);
console.log((bits & CRUD.Update) === CRUD.Update);