CSC/ECE 517 Fall 2009/wiki1b 2 sk: Difference between revisions
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Dynamically typed languages are those in which type checking is done at run-time. In other words, the same entity does not always have the same form during the execution of the program and the type of the object assigned to a variable can be changed at runtime. Variable need not be defined before they are used. Some examples of dynamically typed languages are Ruby, Python, PHP, Smalltalk, Prolog, JavaScript, Objective-C. | Dynamically typed languages are those in which type checking is done at run-time. In other words, the same entity does not always have the same form during the execution of the program and the type of the object assigned to a variable can be changed at runtime. Variable need not be defined before they are used. Some examples of dynamically typed languages are Ruby, Python, PHP, Smalltalk, Prolog, JavaScript, Objective-C. | ||
<br> | <br> | ||
/* Ruby code sample */ | /* Ruby code sample */<br> | ||
a = [1, 2, 3, 4, "Hi"] | a = [1, 2, 3, 4, "Hi"] | ||
The above code declares array that holds mix of integer and string types. Note that there was no need to specify array type and this would be evaluated automatically during runtime. However such a declaration is not possible in statically typed language like C, C++, Java, etc. doing so would give compile time errors. | The above code declares array that holds mix of integer and string types. Note that there was no need to specify array type and this would be evaluated automatically during runtime. However such a declaration is not possible in statically typed language like C, C++, Java, etc. doing so would give compile time errors. | ||
Revision as of 05:34, 20 September 2009
Contents
1.Introduction
1.1 Dynamically Typed Languages 1.2 Statically Typed Languages
2. Advantages of Statically Typed v/s Dynamically typed 3. When Statically Typed is preferred over Dynamically typed 4. Examples 5. Conclusion 6. Glossary 7. References
Introduction
Dynamically Typed Languages
Dynamically typed languages are those in which type checking is done at run-time. In other words, the same entity does not always have the same form during the execution of the program and the type of the object assigned to a variable can be changed at runtime. Variable need not be defined before they are used. Some examples of dynamically typed languages are Ruby, Python, PHP, Smalltalk, Prolog, JavaScript, Objective-C.
/* Ruby code sample */
a = [1, 2, 3, 4, "Hi"]
The above code declares array that holds mix of integer and string types. Note that there was no need to specify array type and this would be evaluated automatically during runtime. However such a declaration is not possible in statically typed language like C, C++, Java, etc. doing so would give compile time errors.