Question 1

Which of the following is a primitive data type in JavaScript?

Accepted Answer

Primitives in JavaScript are: string, number, bigint, boolean, undefined, symbol, and null. Object is a non-primitive reference type.

Question 2

What does the expression `"5" - 5` evaluate to in JavaScript?

Accepted Answer

The subtraction operator `-` only works with numbers. Therefore, JavaScript coerces the string `'5'` to the number `5`, resulting in `0`.

Question 3

What is type coercion in JavaScript?

Accepted Answer

Type coercion is the automatic or implicit conversion of values from one data type to another (e.g., when adding a number and a string).

Question 4

Which method is used to extract a section of a string and return it as a new string, without modifying the original string?

Accepted Answer

The `slice()` method extracts a section of a string and returns it as a new string.

Question 5

What does the expression `"5" + 5` evaluate to in JavaScript?

Accepted Answer

Since one operand is a string, JavaScript uses the `+` operator for string concatenation, coercing the number `5` into a string `'5'`, resulting in `'55'`.

Question 6

Which operator is the ternary operator, acting as a shortcut for an `if-else` statement?

Accepted Answer

The ternary operator is the only JavaScript operator that takes three operands: a condition, `?` if true, and `:` if false.

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