Q
What will the following code snippet output: let a = 10; a += '5'; console.log(a); in JavaScript?

Answer & Solution

Answer: Option A
Solution:
The += operator performs concatenation if one of the operands is a string, resulting in '105'.
Related Questions on Average

What is the data type of the value 42 in JavaScript?

A). String

B). Boolean

C). Number

D). Null

Which data type represents an intentional absence of any value in JavaScript?

A). Null

B). Undefined

C). String

D). Number

What is the data type of the value undefined in JavaScript?

A). Number

B). Boolean

C). String

D). Undefined

Which data type represents positive infinity in JavaScript?

A). Infinity

B). Number

C). NaN

D). Null

What is the outcome of typeof [1, 2, 3] in JavaScript?

A). String

B). Number

C). Array

D). Object

What is the data type of the value 'null' (with quotes) in JavaScript?

A). String

B). Number

C). Null

D). Undefined

Which of these is a complex or reference data type in JavaScript?

A). Number

B). Boolean

C). Object

D). String

What is the outcome of typeof undefined in JavaScript?

A). String

B). Undefined

C). Null

D). Number

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