console.log(x);
var x = 12;

• A)undefined
• B)12
• C)SyntaxError
• D)ReferenceError

console.log("2" + "2"- "2");

• A)20
• B)2
• C)SyntaxError
• D)0

console.log(x);
let x = 12;

• A)undefined
• B)12
• C)SyntaxError
• D)ReferenceError

const x = 12;
x = 100;
console.log(x);

• A)TypeError
• B)100
• C)12
• D)ReferenceError

console.log(12.toString());

• A)"12"
• B)12
• C)SyntaxError
• D)ReferenceError

console.log("0" === []);

• A)true
• B)false
• C)SyntaxError
• D)ReferenceError

console.log([] === []);

• A)true
• B)false
• C)SyntaxError
• D)ReferenceError

console.log("12" == 12);

• A)true
• B)false
• C)SyntaxError
• D)ReferenceError

console.log(String("12") === 12);

• A)true
• B)false
• C)SyntaxError
• D)ReferenceError

console.log(String("12") === String("12"));

• A)true
• B)false
• C)SyntaxError
• D)ReferenceError

console.log(+"12");

• A)12
• B)null
• C)SyntaxError
• D)"12"

console.log(3 < 2 < 1);

• A)false
• B)SyntaxError
• C)true
• D)ReferenceError

console.log(3 + 2 * 4);

• A)11
• B)SyntaxError
• C)20
• D)ReferenceError

function person() {
  console.log(name);
  console.log(age);
  var name = "Ayoub";
  let age = 17;
}
person();

• A)Ayoub & undefined
• B)Ayoub & ReferenceError
• C)ReferenceError & 17
• D)undefined & ReferenceError

let obj = {
  name: "Ayoub",
  info: fucntion () {
    console.log(this.name);
  }
}
obj.info()

• A)window
• B)SyntaxError
• C)Ayoub
• D)ReferenceError

  let x = {name: "Ayoub"};
  let y;
  x = y;
  x.name = "Ali";
  console.log(y.name)

• A)Ali
• B)undefined
• C)Ayoub
• D)ReferenceError

let num = 0;
console.log(num++);
console.log(++num);
console.log(num);

• A)0 2 2
• B)1 2 2
• C)0 1 2
• D)1 1 2

for (var i = 0; i < 3; i++) {
  setTimeout(() => console.log(i), 1);
}

for (let i = 0; i < 3; i++) {
  setTimeout(() => console.log(i), 1);
}

• A)0 1 2 & 3 3 3
• B)0 1 2 & 0 1 2
• C)3 3 3 & 0 1 2
• D)ReferenceError

const name = "Ayoub";
age = 17;
console.log(delete name);
console.log(delete age);

• A)false & true
• B)Ayoub & 17
• C)undefined & undefined
• D)ture & true

const set = new Set([1, 1, 2, 3, 4]);
console.log(set);

• A){1, 1, 2, 3, 4}
• B)[1, 2, 3, 4]
• C){1, 2, 3, 4}
• D)[1, 1, 2, 3, 4]

(() => {
  let x = (y = 10);
})();
console.log(typeof x);
console.log(typeof y);

• A)object & number
• B)number & number
• C)undefined & number
• D)number & undefined

[1, 2, 3].map(num => {
  if (typeof num === "number") return;
  return num * 2;
});

• A)[undefined, undefined, undefined]
• B)[null, null, null]
• C)[ 3 x empty ]
• D)[ ]

const x = parseInt("3*2", 10);
console.log(x);

• A)"6"
• B)6
• C)NAN
• D)3

let person = { name: "ayoub" };
const m = [person];
person = null;

console.log(members);

• A)[{ name: "ayoub" }]
• B)[null]
• C)[{ }]
• D)null

function* generator(i) {
  yield i;
  yield i * 2;
}
const g = generator(10);
console.log(g.next().value);
console.log(g.next().value);

• A)20, 20
• B)10, 20
• C)[0, 10], [10, 20]
• D)0, 10 & 10, 20

const firstPromise = new Promise((res, rej) => {
  setTimeout(res, 500, "one");
});
const secondPromise = new Promise((res, rej) => {
  setTimeout(res, 100, "two");
});
Promise.race([firstPromise, secondPromise]).then(res => console.log(res));

• A)"two" "one"
• B)"two"
• C)"one" "two"
• D)"one" "two"

console.log(typeof typeof 1);

• A)"string"
• B)number
• C)Array
• D)Object

console.log(+ "1" + + "1" + "1");

• A)"21"
• B)21
• C)3
• D)Error

const isTrue = true == [];
const isFalse = true == ![];
console.log(isTrue + isFalse)

• A)0
• B)"true"
• C)true
• D)1

const numbers = [33, 2, 8];
numbers.sort();
console.log(numbers[1])

• A)33
• B)2
• C)8
• D)6

function test(x = 3, y) {
  return [x, y]
}
console.log(test(2))

• A)[2, 3]
• B)[3, 2]
• C)[2, undefined]
• D)[undefined, 3]

const str = "foo bar";
const p = [...str].map(e => {
  e.toUpperCase();
}).join("_")
console.log(p);

• A)Foo_Bar
• B)undefined
• C)F_O_O_B_A_R
• D)F_O_O B_A_R