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Operators and Expressions JavaScript
Question 1
What is the value of x after the following code is executed?
let x = 5;
x = x++ + 5;
- A
11
- B
10
- C
15
- D
6
Question 2
What is the result of true + true in JavaScript?
- A
2
- B
true
- C
false
- D
"truetrue"
Question 3
What will be the value of a after the following code?
let a = 10;
a -= 3;
a -= -2;
console.log(a);
5
9
7
10
Question 4
What will be the value of n after the following code?
let n = '';
n ??= 'Hello';
console.log(n);
- A
undefined
- B
'Hello'
- C
null
- D
""
Question 5
What is the result of "2" > "12" in JavaScript?
- A
true
- B
false
- C
Error
- D
undefined
Question 6
What is the result of NaN == NaN in JavaScript?
- A
true
- B
undefined
- C
Error
- D
false
Question 7
What is the result of 10 > "5" in JavaScript?
- A
true
- B
Error
- C
false
- D
undefined
Question 8
What is the value of str.length for the following string?
let str = "Hello, World!";
- A
12
- B
14
- C
13
- D
15
Question 9
What is the output of the following code?
let str = "JavaScript";
str[0] = "T";
console.log(str);
- A
TavaScript
- B
None of the above
- C
Error
- D
JavaScript
Question 10
Which of the following is a valid string interpolation syntax?
- A
'My age is ${age}'
- B
"My age is " + age"
- C
`My age is ${age}`
- D
Both B and C
There are 10 questions to complete.