Student id: 4160 Necha turdagi execution context mavjud va ular qaysilar?

STUDENT ID: ____4160_______

1. 
   Necha turdagi execution context mavjud va ular qaysilar?
   
   1. 
      2 turdagi local va tashqi
      
   2. 
      2 turdagi global va local
      
   3. 
      2 turdagi global va funksiya
      

Javobi C

2. 
   Quidagi misolda loglar qay tartibda chiqadi? console.log(“foo”); setTimeout(() => { console.log(“bar”);
   

}, 0); console.log(“baz”);

1. 
   foo -> baz -> bar
   
2. 
   foo -> bar -> baz
   
3. 
   foo -> baz
   

-> bar
Javobi C

3. 
   Quidagi misolda loglar qay tartibda chiqadi?
   

function a() { setTimeout(() => c(), 0); console.log(“foo”);
} function b() { setTimeout(() => { console.log(“baz”);
}, 300) } function c() { b(); setTimeout(() => { console.log(“bar”);
}, 500) } a();
______”foo”,”baz”,”bar”,”bar”____________

4. 
   sum funksiyasini call methodi bilan chaqiring?
   

function sum(arr) { return arr.reduce((prev, curr) => prev + curr,0)
}
const arr = [1, 2, 3, 4];
const sumWithApply = sum.apply({},[arr]); const sumWithCall = __= sum.call({},arr); ______________________

4. 
   Quidagi misol nima natija beradi?
   

function foo() { console.log(this.a);
}
const baz = foo.bind({ a: 10 }); const bar = baz.bind({ a: 11 });
baz(); bar();

1. 
   10 -> 11
   
2. 
   10 -> 10
   
3. 
   TypeError Line 5
   

Javob C chunki bind bir marta ishleydi

4. 
   OOPda enkapsulasi nima?
   qobiqlashtrish function va ozgaruvchilarni bitta joyda saqlash
   

______________________________________________________________________

4. 
   OOPda inheritance nima?
   

____________________________avlod olish__________________________________________ 8. OOPda abstraction nima?
_______________________________________________________mavhumlik______________

9. 
   OOPda poliformizm nima?
   

______________________________________________________________________

9. 
   Node.jsda necha turdagi modulelar mavjud?
   

________________________________________3 turdagi______________________________

9. 
   fs kutobxonasi necha turdagi apilar beradi
   
   1. 
      promise, callback, sinxron
      
   2. 
      bufferli va streamli
      

Javob A

9. 
   Quidagi misolni promise bilan yozing
   

fs.readFile(‘./example.txt’, (err, file) => { if(err) { console.log(‘Error’, err); return;
} console.log(file);
})

javobi
const fs = require('fs');

const readFilePromise = (filePath) => {

return new Promise((resolve, reject) => {
fs.readFile(filePath, (err, data) => {
if (err) {
reject(err);
} else {
resolve(data);
}
});
});
};

readFilePromise('./example.txt')

.then((data) => {
console.log(data);
})
.catch((err) => {
console.log('Error', err);
});

Consolega nima natija chiqadi?

const e = new EventEmitter(); e.once(‘bar’, () => { console.log(‘bar’);
})
e.emit(‘bar’);
e.emit(‘bar’);

1. 
   bar -> bar
   
2. 
   bar
   
3. 
   bar -> Error is thrown
   

javobi C chunki once bir marta ishlaydi

9. 
   Node.jsga Buffer nima uchun kerak?
   
10. 
    Streamlar nima uchun kerak?katta malumotlarni bollaklab uzatish uchun