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Dynamic type checking is the process of verifying the type safety of a program at runtime. Implementations of dynamically type-checked languages generally associate each runtime object with a type tag (i.e., a reference to a type) containing its type information. This runtime type information (RTTI)
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See moreIn programming languages, a type system is a logical system comprising a set of rules that assigns a property called a type to the various constructs of a computer program, such as variables, expressions, functions or modules.
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See moreAn example of a simple type system is that of the C language. The portions of a C program are the function definitions. One function is invoked by another function. The interface of a function states the name of the function and a list of parameters that are
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See moreFormally, type theory studies type systems. A programming language must have the opportunity to type check using the type system whether at compile time or runtime, manually
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See moreThe process of verifying and enforcing the constraints of types—type checking—may occur at compile time (a static check) or at run-time.
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See moreThe term polymorphism refers to the ability of code (especially, functions or classes) to act on values of multiple types, or to the ability of different instances of the same data structure to
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See moreMany type systems have been created that are specialized for use in certain environments with certain types of data, or for out-of-band static program analysis. Frequently, these are
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See moreMany static type systems, such as those of C and Java, require type declarations: the programmer must explicitly associate each variable with a
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Some dynamic languages offer an eval function. This function takes a string parameter containing code in the language and executes it. If this code stands for an expression, the resulting value is returned. However, Erik Meijer and Peter Drayton suggests that programmers "use eval as a poor man's substitute for higher-order functions."
A type or object system can typically be modified during runtime in a dynamic language. This ca…Wikipedia · Text under CC-BY-SA license