Answer & Solution
Answer: Option A
Solution:
The += operator performs concatenation if one of the operands is a string, resulting in '105'.
Q
What will the following code snippet output: let a = 10; a += '5'; console.log(a); in JavaScript?
Related Questions on Average
What is the data type of the value undefined in JavaScript?
A). Number
B). Boolean
C). String
D). Undefined
What will let x = '10'; let y = x - 5; console.log(y); output in JavaScript?
A). '5'
B). 5
C). '10'
D). 10
What is the data type of the value 'null' (with quotes) in JavaScript?
A). String
B). Number
C). Null
D). Undefined
Which data type represents an intentional absence of any value in JavaScript?
A). Null
B). Undefined
C). String
D). Number
What is the outcome of typeof [1, 2, 3] in JavaScript?
A). String
B). Number
C). Array
D). Object
What does NaN represent in JavaScript?
A). Not a Number
B). Infinity
C). Positive Infinity
D). Negative Infinity
What will let x = null; console.log(typeof x); output in JavaScript?
A). Object
B). Null
C). Undefined
D). Number
What is the outcome of typeof undefined in JavaScript?
A). String
B). Undefined
C). Null
D). Number
Which operator checks if an object is an instance of a specific object type in JavaScript?
A). instanceof
B). typeof
C). isInstanceof
D). isTypeOf
What is the result of 0 / 0 in JavaScript?
A). Infinity
B). 0
C). NaN
D). 1