The typeof function in JavaScript is used to determine the data type of a variable. It returns a string indicating the type of the operand, such as 'string', 'number', or 'boolean'. This aids in debugging and ensuring that operations on variables are type-appropriate.
The typeof function in JavaScript is an operator that returns a string indicating the type of the unevaluated operand, or the type of value. In other words, it tells you what type of data a variable is, such as string, number, boolean, undefined, object, function, or symbol. This is particularly useful for debugging or for determining the type of a value before performing a specific operation on it. For instance, you might use typeof in an if statement to determine if a variable is a string before trying to manipulate it with string-specific methods.
- typeof "hello"; // "string"
- typeof 42; // "number"
- typeof true; // "boolean"
typeof is a very handy function for identifying the type of values in JavaScript which aids developers in writing accurate and bug-free code by assuring the correct types are used.