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In a dynamically typed language, a variable is simply a value bound to a name; the value has a type -- like "integer" or "string" or "list" -- but the variable itself doesn't. As the name suggests, variables' types are dynamic, means even after you set a variable to a type you can change it. A programming language is said to be dynamically typed if the programmer doesn’t have to assign a type explicitly, and a type isn’t assigned to the variable until run-time. Advantages of dynamically-typed languages: Whether you could use a similar approach in Javascript is, of course, an open question. Dynamically typed. Some dynamically typed languages include Python, Perl, Ruby, etc. Since the advent of dynamic programming languages, there has been ongoing debate about which language paradigm; statically-typed or dynamically-typed is … What is dynamic? Comparing type systems, there's no advantage in dynamic typing. You don’t have to specify types every time. Dynamic typing is a special case of static typing - it's a statically-typed language where every variable has the same type. A compiled language will have better performance at run-time if it’s statically typed because the knowledge of types allows for machine code optimization. Dynamically vs Statically Typed Languages This StackOverflow Q&A gives us an idea on the difference between Statically and Dynamically Typed languages: A language is statically typed if the type of a variable is known at compile time. Dynamically typed language is called so because the type is associated with run-time values. But what does that actually mean? Let’s jump in and take a look. Dynamically-typed languages are uni-typed. JavaScript is dynamically typed, that simple means that types can change at run time. You trade some of the flexibility that a loosely typed language gives you to get more security and trust in the codebase. Untyped You could have a variable which, right now, holds a number, and later assign a string to it if you need it to change. For example, in dynamically typed languages, if you’re not careful with sanitising user input, you can end up doing weird stuff like (for example) trying to add a number 10 with the string “8” and you would get the string “108” as a result instead of the number 18 that you were expecting. Since Javascript is a dynamically typed language, returning an 'object' seems like the obvious choice. A dynamically typed language still can be annotated (by such 'casts'), which helps to fall back to a type inference in a smart static compiler. We don't have to declare the type of a variable or manage the memory while assigning a value to a variable in Python.Other languages like C, C++, Java, etc.., there is a strict declaration of variables before assigning values to them. 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