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
Which of these is a complex or reference data type in JavaScript?
A). Number
B). Boolean
C). Object
D). String
What is the result of 0 / 0 in JavaScript?
A). Infinity
B). 0
C). NaN
D). 1
What is the outcome of typeof [1, 2, 3] in JavaScript?
A). String
B). Number
C). Array
D). Object
Which of the following is not a valid data type in JavaScript?
A). Array
B). Symbol
C). Map
D). Tuple
Which data type represents unique and immutable values in JavaScript introduced in ES6?
A). Symbol
B). Object
C). Array
D). Function
What is the data type of the value 42 in JavaScript?
A). String
B). Boolean
C). Number
D). Null
What is the data type of the value undefined in JavaScript?
A). Number
B). Boolean
C). String
D). Undefined
What is the outcome of typeof undefined in JavaScript?
A). String
B). Undefined
C). Null
D). Number
What will let x = '10'; let y = x - 5; console.log(y); output in JavaScript?
A). '5'
B). 5
C). '10'
D). 10
Which operator checks if an object is an instance of a specific object type in JavaScript?
A). instanceof
B). typeof
C). isInstanceof
D). isTypeOf