What is a programming language.
Programming language is a series of code instructions that run the CPU and process them and gives the output to the user.
There are a different set of programming languages
Procedural language
Functional Programming language
Object-oriented programming language
Similarly, There are two types of programming languages
High-level programming language Low-level languages also called machine or assembly languages
Difference between Procedural and Object-Oriented programming languages
Here is a comparison of both languages.
| Procedure Language | Object-Oriented Language |
|---|---|
| Contains Procedure | Contains Methods |
| Records | Objects |
| Modules | Classes |
Difference between High level and low-level programming languages
Machines and computers understand low-level language code only. So high-level languages need an interpreter or compiler to generate low-level machine-readable code.
| Hight Level Language | Low-Level Languages |
|---|---|
| Code written need to compile to machine-readable code,because of compilation time, It takes some time to process | Low-level code understands by machines, and directly runs, so faster |
| Human readable code | machine readable code |
| It is very easy to write and modify code | It is difficult to write code directly |
| Productivity is good as takes lesser time to write a code | Time is taken to write code is more |
| Code is easy to run on different devices and platforms with lesser modifications | Code only runs on specific computers or types, Need code rewrite to run on another machine |
| Compilers and interpreter required | Not required any middleman tools |
| Examples languages are Java,Dart, Golang etc | Assembly is an example |
Language Type checking
Type checking is a process of evaluating variable type at compile type or runtime There are two types of type checking
- Statically Type checking
Languages allow you to type check at compile type.
This variable is declared and assigned to a type, you can not change the type. Types are assigned with variables, not data.
For example, In java, You declare a variable of the type String.
String str="Welcome"; // allowed
str=20 // Not allowed to reassign the values
- Dynamically type checking
These languages do type checking at runtime. In this variable is declared and assigned to a type, you can change the type and values dynamically. Types are assigned with data, not variables. For example, In javascript, You declare a variable of the type String.
var str="Welcome"; // allowed
str=20 // allowed
What is the difference between Statically Typed and Dynamically Typed programming language
| Statically typed languages | Dynamically typed languages |
|---|---|
| Type checking is done at compile time | Type checking is done at Run time |
| Variables types must be declared | Variables types are not required but dynamic types |
| Reassign variable with different type value is not possible | Allows to reassign variable with different type data |
| Variables and expressions are evaluated at compile type | Variables and expressions are evaluated at runtime |
| Java,C,C++ | Javascript,Python,Ruby |
| Advantages are errors are caught at compile time | Error-prone at runtime time |
| Good in terms of performance | Lower performance |
| Compilation time is more | Compilation time is less |
Static and Dynamic variable scopes
There are two types scoping in variables on a language
- Lexical scoping or static scope
- Dynamic scoping
Different types of programming
- Imperative programming
In this programming, Line of code is executed sequentially, and returns the result.
Functional Programming: In this, Every feature is written in as a functions and assign to variables to change state.
Reactive Programming
This is based on asynchronous data of streams of events, pushes the data when event is listened for subscribe.
Programming languages provides different functions types as given below
- Lambda or Arrow Functions
- First Class Functions
- High Order Functions
- First Order Functions
- Unary Functions
- Currying Functions
- Pure Functions
- Impure Functions
First Class Functions in programming language.
Functions are treated similarly to like a variables. Variables can be assigned and pass, return from Functions. Similarly Functions can be assigned, pass as an argument to Function and Returned from a Function
Programming language paradigm
There are many categories of language paradigm
- Imperative
- Functional
- Object Oriented
- Declarative
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