Type check is a process performed by a computer program to verify that a value is of a certain type. This is usually done with an assertion, which can raise an error if the value does not meet the expectation. Programmers often use type checking to ensure that a data structure contains the correct type of information to prevent errors.
Type checking is important for ensuring the reliability and accuracy of a program. By verifying that the values are the expected type, the program can ensure that the data will be interpreted correctly. For example, a program that calculates the area of a circle needs to ensure that the arguments passed in are a radius and not something else.
Type checking can be implemented in many different ways. Static type checking is a process in which a type check is performed at compile-time. This means that if the type does not match the expectation, the compiler will reject the program. Dynamic type checking is done at run-time by the software and may involve a try-catch error structure or conversion to the correct type.
Type checking can also involve checking primitives. In this case, the programmer might test whether an integer input is less than a certain number or greater than another number. This can be implemented by the programmer using an if-else statement.
Programmers may also use type conversion when type checking. This involves converting a data type to another data type. For example, a floating point number can be converted to an integer. Type conversion can be useful when combining different types of data in a program.
Type checking can help improve the accuracy and robustness of a program. By ensuring that the correct data type is used for a given scenario, the program can help prevent errors from occurring. This is why type checking is an important part of programming.