Primitive Data Mocktest

The String data type is used to represent textual data in JavaScript, such as words, sentences, or characters. Strings are enclosed in single quotes ('') or double quotes ("").

The Boolean data type represents logical values in JavaScript. It can have two values: true or false. Booleans are often used in conditional statements and logical operations to control the flow of the program based on true/false conditions.

The Undefined data type represents variables that have been declared but not assigned a value. It signifies that the variable exists in memory but doesn't hold any specific value yet.

The Null data type is used in JavaScript to explicitly indicate that a variable does not have a value or to reset a variable's value to null. It's distinct from undefined, which represents variables that have not been assigned a value.

The Symbol data type is used to create unique identifiers in JavaScript, introduced in ECMAScript 6. Symbols are often used as property keys in objects to avoid naming collisions in complex data structures.

The typeof operator in JavaScript returns "number" when applied to a numeric value, indicating the data type of the value.

The typeof operator in JavaScript returns "string" when applied to a string value, indicating the data type of the value.

The value null in JavaScript represents the Null data type, indicating an intentional absence of value or object reference.

The typeof operator in JavaScript returns "boolean" when applied to a boolean value, indicating the data type of the value.

The Null data type represents variables that have been explicitly set to have no value or to represent an intentional absence of value.