Question

The "extra" key value is a ______ value.

Note: This means it has no value at all, however, are not the same numeric value of 0.

a) Null
b) Undefined
c) False
d) Empty

Answer 1

In programming, the "extra" key value is a null value, representing the absence of any value and distinct from undefined, false, or an empty state.

Step-by-step explanation:

The "extra" key value you're asking about is a null value. In programming, a null value represents the absence of a value or a 'nothing' state. It is used to indicate that a variable does not point to any object or location in memory. The null value is distinct from undefined, false, or an empty string, as it is used in scenarios where a variable has been declared but intentionally set to no particular value.

For example, in JavaScript:

• Null is an assigned value meaning 'nothing'.
• Undefined means a variable has been declared but has not yet been assigned a value.
• False is a boolean value indicating the condition 'not true'.
• Empty is a term that can be used to describe an empty string or an array with no elements.