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);

Mar 24, 2025 - 17:32

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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