Dynamically-typed languages are those (like JavaScript) where the interpreter assigns variables a type at runtime based on the variable’s value at the time.

A dynamically typed language is a programming language where variables are not bound to a specific data type at compile-time. In dynamically typed languages, the type of a variable is determined and checked at runtime, as opposed to statically typed languages where variable types are checked at compile-time.

In a dynamically typed language, you can assign different types of values to the same variable without explicitly declaring its type. The type of a variable can change during the execution of the program based on the type of the value assigned to it. This flexibility allows for more concise and expressive code, as developers do not need to explicitly specify types for variables.

For example, in a dynamically typed language like Python, you can assign an integer value to a variable:

x = 5


Later in the program, you can assign a string value to the same variable:

x = <span class="hljs-string">"Hello, world!"</span>


The language allows this dynamic type change without requiring explicit type declarations or conversions. However, it also means that type errors might only be discovered at runtime, which can lead to potential issues if the code is not carefully written and tested.

Some popular dynamically typed languages include Python, JavaScript, Ruby, and Perl. These languages provide flexibility and rapid development capabilities, but they may have certain performance trade-offs compared to statically typed languages.

Languages with dynamic typing, such as JavaScript, allow the interpreter to type variables at runtime based on their current values.
A type of high-level programming language known as dynamic programming languages, or DPLs, executes many typical behaviors at runtime that other languages might only conduct during compilation, if at all.
In contrast, type-checking happens during execution in languages that use dynamic typing.
This indicates that variables are only type-checked when the program is running.
The programming languages Python, JavaScript, Lisp, PHP, Ruby, Perl, Lua, and Tcl are some examples of those that fall under this group.