Typeof Operator in Javascript 2023

In JavaScript, the typeof operator is a built-in unary operator that allows you to determine the data type of a given value or expression. It is often used to check the type of a variable or a value at runtime


Here, operand is the value or variable whose type you want to determine. The typeof operator returns a string representing the data type of the operand. The possible return values are as follows:


"undefined": If the operand is an undefined value.
"boolean": If the operand is a boolean value (true or false).
"number": If the operand is a number, including integers, floating-point numbers, and special numeric values like NaN, Infinity, and -Infinity.
"string": If the operand is a string of characters.
"bigint": If the operand is a BigInt, which is a special numeric type that can represent arbitrarily large integers.
"symbol": If the operand is a Symbol, which is a unique and immutable data type introduced in ECMAScript 6.
"function": If the operand is a function.
"object": If the operand is an object, null, array, or any other non-primitive data type. Note that arrays and null have the data type of "object" as well.
"null": If the operand is null. (Note: Despite being an object, null returns "null" instead of "object" to maintain backward compatibility.)