Answer & Solution
Answer: Option B
Solution:
<div>The code x += '2' is equivalent to x = x + '2', resulting in concatenation of the string '2' to the number 5, giving '72'.</div>
Q
What will be the value of x after executing the code: let x = 5; x += '2';?
Related Questions on Average
What is the value of x after executing the code: let x = 10; x += 5; x /= 3;?
A). 5
B). 15
C). 33
D). 67
What will be the output of '2' + 2 + 2 in JavaScript?
A). '222'
B). 6
C). 4
D). Error
What will be the value of x after executing the code: let x = 10; x -= 2; x *= 3;?
A). 24
B). 30
C). 36
D). 12
What will be the result of 5 == '5' in JavaScript?
A). 1
B). 0
C). Error
D). Undefined
What does the unary operator + do to a string in JavaScript?
A). Concatenates it
B). Ignores it
C). Converts it to a number
D). Throws an error
What will be the result of 10 + '5' in JavaScript?
A). 15
B). 105
C). NaN
D). Error
What will be the result of '10' + 10 in JavaScript?
A). '1010'
B). 20
C). NaN
D). Error
What does the operator === do in JavaScript?
A). Checks for equality without type conversion
B). Assigns a value
C). Performs a strict comparison
D). Concatenates strings
What does the typeof operator return for an array in JavaScript?
A). 'array'
B). 'object'
C). 'null'
D). 'undefined'
What will be the output of '7' - 3 in JavaScript?
A). 4
B). '4'
C). NaN
D). Error