Mastering JavaScript Assignment Operators: Key Questions and Concepts

Question 1:

• What will be the value of x after this code executes?

let x = 10;
x = 5;

Options:

• a) 10
• b) 5
• c) undefined
• d) Error

Question 2:

• What will be the value of result after the following code?

let result = 8;
result = result + 3;

Options:

• a) 11
• b) 8
• c) 5
• d) 3

Question 3:

• What is the value of x after this code runs?

let x = 2;
x = x * 3;

Options:

• a) 6
• b) 5
• c) 3
• d) 2

Question 4:

• What will the value of y be after executing this code?

let y = 7;
y = y - 4;

Options:

• a) 7
• b) 3
• c) 4
• d) 10

Question 5:

• What does the following code do?

let a = 15;
a = a / 3;

Options:

• a) Sets a to 45
• b) Sets a to 5
• c) Divides a by 3
• d) Sets a to 18

Question 6:

• What is the output of the following code?

let x = 4;
let y = 2;
x += y;
console.log(x);

Options:

• a) 4
• b) 6
• c) 2
• d) 8

Question 7:

• What will be the value of z after this code?

let z = 5;
z *= 3;

Options:

• a) 15
• b) 5
• c) 10
• d) 3

Question 8:

• What is the value of num after this code?

let num = 20;
num /= 4;

Options:

• a) 4
• b) 5
• c) 10
• d) 2

Question 9:

• What will be the value of score after executing the following code?

let score = 30;
score += 5;
score *= 2;

Options:

• a) 35
• b) 65
• c) 70
• d) 60

Question 10:

• What is the result of the following code?

let x = 8;
x -= 4;
x += 3;
console.log(x);

Options:

• a) 7
• b) 10
• c) 5
• d) 6

Question 11:

• What will be the output of this code?

let a = 5;
let b = 10;
a += b;
b = a * 2;
console.log(a, b);

Options:

• a) 15,30
• b) 10,30
• c) 15,20
• d) 5,20

Question 12:

• What does this code do?

let value = 5;
value *= 4;
value /= 2;

Options:

• a) Sets value to 10
• b) Sets value to 20
• c) Doubles value
• d) Multiplies value by 2 and then divides it by 4

Question 13:

• What is the value of total after executing the following code?

let total = 100;
total -= 20;
total /= 2;

Options:

• a) 40
• b) 80
• c) 90
• d) 50

Question 14:

• What will be the value of a after the following code executes?

let a = 12;
a += 4 * 2;

Options:

• a) 24
• b) 20
• c) 18
• d) 16

Question 15:

• What is the value of count after this code?

let count = 10;
count *= 5;
count /= 10;

Options:

• a) 50
• b) 10
• c) 5
• d) 100

Question 16:

• What will be the value of result after the following code?

let result = 15;
result += 5;
result *= 3;
result /= 2;

Options:

• a) 30
• b) 45
• c) 25
• d) 15

Question 17:

• What does the following code do?

let num = 6;
num *= 4;
num %= 7;

Options:

• a) Sets num to 4
• b) Sets num to 6
• c) Sets num to 3
• d) Sets num to 2

Question 18:

• What will be the output of this code?

let x = 20;
x -= 5;
x *= 2;
x /= 5;
console.log(x);

Options:

• a) 10
• b) 15
• c) 5
• d) 20

Question 19:

• What is the final value of z after executing this code?

let z = 7;
z += 3;
z -= 4;
z *= 2;

Options:

• a) 10
• b) 12
• c) 8
• d) 6

Question 20:

• What is the value of total after this code?

let total = 12;
total += 8;
total /= 4;
total *= 5;

Options:

• a) 25
• b) 20
• c) 15
• d) 30

Question 21:

• What will be the output of this code?

let x = 10;
x = x * 2;
x %= 3;
console.log(x);

Options:

• a) 2
• b) 3
• c) 1
• d) 0

Question 22:

• What is the value of x after executing the following code?

let x = 5;
x *= 4;
x += 2;
x %= 3;

Options:

• a) 1
• b) 2
• c) 5
• d) 4

Question 23:

• What will be the output of this code?

let a = 20;
a /= 4;
a *= 3;
a += 5;
console.log(a);

Options:

• a) 20
• b) 25
• c) 35
• d) 30

Question 24:

• What will be the value of str?

let str = "Hello";
str += " World!";
console.log(str); 

Options:

• a) Hello World
• b) HelloWorls
• c) str
• d) Hello + World

Question 25:

• What will be the value of arr after this code executes?

let arr = [1, 2, 3];
arr[1] = 10;

Options:

• a) [1, 10, 3]
• b) [1, 2, 10]
• c) [10, 2, 3]
• d) [1, 2, 3]

Question 26:

• What will be the value of x and y after this code executes?

const obj = { x: 10, y: 20 };
const { x, y } = obj; 
console.log(x, y); 

Options:

• a) 10 , 20
• b) undefined , undefined
• c) 10 , 10
• d) 20 , 10

Question 27:

• What will be the value of the array arr after the following code?

let arr = [1, 2, 3];
arr[1] = arr[0] + arr[2];
console.log(arr);

Options:

• a) [1, 3, 3]
• b) [1, 2, 3]
• c) [1, 4, 3]
• d) [1, 5, 6]

Question 28:

• What will the output of the following code be?

const obj = { a: 1, b: 2 };
obj.b = 3;
console.log(obj);

Options:

• a) { a: 1, b: 2 }
• b) { a: 1, b: 3 }
• c) { a: 3, b: 2 }
• d) { a: 1, b: 5 }

Question 29:

• What will the output of the following code be?

let person = { name: 'Alice', age: 30 };
person.age += 1;
console.log(person);

Options:

• a) { name: 'Alice', age: 31 }
• b) { name: 'Alice', age: 30 }
• c) { name: 'Bob', age: 31 }
• d) { name: 'Alice', age: 32 }

Question 30:

• What will be the output of the following code, considering hoisting?

console.log(x);  // undefined
var x = 100;

Options:

• a) 100
• b) undefined
• c) ReferenceError
• d) null

Question 31:

• What will be the output of the following code,

let x = "5";
let y = 5;
console.log(x == y);

Options:

• a) true
• b) false
• c) undefined
• d) NaN

Question 32:

• What will be the output of the following code,

let a = "5";
let b = 5;
console.log(a === b);

Options:

• a) true
• b) false
• c) undefined
• d) NaN

Question 33:

• What will be the output of the following code,

let x = 0;
let y = false;
console.log(x == y);

Options:

• a) true
• b) false
• c) undefined
• d) NaN

Question 34:

• What will be the output of the following code,

let a = 0;
let b = "";
console.log(a == b);

Options:

• a) true
• b) false
• c) undefined
• d) NaN

Question 35:

• What will be the output of the following code,

let a = "100";
let b = 100;
console.log(a == b);

Options:

• a) true
• b) false
• c) undefined
• d) NaN

Question 36:

• What will be the output of the following code,

let x = 10;
let y = "10";
console.log(x === y);

Options:

• a) true
• b) false
• c) undefined
• d) NaN

Question 37:

• Which of the following comparisons will return true?

let x = null;
let y = undefined;

Options:

• a) x == y
• b) x === y
• c) x != y
• d) x === null

Question 38:

• What will be the value of a after the following code runs?

let a = "5";
let b = 10;
a = b + a;
console.log(a);

Options:

• a) "510"
• b) 15
• c) "5"
• d) Nan

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