Salesforce JavaScript Developer Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The 'null' value in JavaScript specifically signifies the intentional absence of any value or object reference. It is a primitive data type that is used to indicate that a variable has been explicitly assigned with no value. This is different from 'undefined', which indicates that a variable has been declared but has not yet been assigned a value or that a function call does not return a value.

Using 'null' allows developers to clearly express that a variable is meant to contain a value later on but currently does not. It can be particularly useful for initializing variables or for signaling that an object is intentionally empty.

The other options address different concepts within JavaScript. For instance, a variable that has not been declared does not have a value of 'null'; it is simply undeclared. Similarly, an undefined function return signifies that a function has been executed without returning a value, which is distinct from 'null'. Lastly, while a placeholder for future object creation may seem relevant to variables, 'null' itself does not serve that purpose; rather, it simply indicates the absence of a meaningful value.