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ook for beginners english español 中文 简体字 italiano português українська 日本語 한국어 menu forum curriculum night mode donate december 12 2022 beginner what is programming a handbook for beginners estefania cassingena navone welcome to the amazing world of programming this is one of the most useful and powerful skills that you can learn and use to make your visions come true in this handbook we will dive into why programming is important its applications its basic concepts and the skills you need to become a successful programmer you will learn what programming is and why it is important what a programming language is and why it is important how programming is related to binary numbers real world applications of programming skills you need to succeed as a programmer tips for learning how to code basic programming concepts types of programming languages how to contribute to open source projects and more are you ready let s begin what is programming programming is essential for our everyday lives did you know that computer programming is already a fundamental part of your everyday lives let s see why i m sure that you will be greatly surprised every time you turn on your smartphone laptop tablet smart tv or any other electronic device you are running code that was planned developed and written by developers this code creates the final and interactive result that you can see on your screen that is exactly what programming is all about it is the process of writing code to solve a particular problem or to implement a particular task programming is what allows your computer to run the programs you use every day and your smartphone to run the apps that you love it is an essential part of our world as we know it whenever you check your calendar attend virtual conferences browse the web or edit a document you are using code that has been written by developers and what is code you may ask code is a sequence of instructions that a programmer writes to tell a device like a computer what to do the device cannot know by itself how to handle a particular situation or how to perform a task so developers are in charge of analyzing the situation and writing explicit instructions to implement what is needed to do this they follow a particular syntax a set of rules for writing the code a developer or programmer is the person who analyzes a problem and implements a solution in code sounds amazing right it s very powerful and you can be part this wonderful world too by learning how to code let s see how you as a developer let s put you in a developer s shoes for a moment imagine that you are developing a mobile app like the ones that you probably have installed on your smartphone right now what is the first thing that you would do think about this for a moment the answer is analyzing the problem what are you trying to build as a developer you would start by designing the layout of the app how it will work its different screens and functionality and all the small details that will make your app an awesome tool for users around the world only after you have everything carefully planned out you can start to write your code to do that you will need to choose a programming language to work with let s see what a programming language is and why they are super important what is a programing language logos of popular programming languages a programming language is a language that computers can understand we cannot just write english words in our program like this computer solve this task and hope that our computer can understand what we mean we need to follow certain rules to write the instructions every programming language has its own set of rules that determine if a line of code is valid or not because of this the code you write in one programming language will be slightly different from others tip some programming languages are more complex than others but most of them share core concepts and functionality if you learn how to code in one programming language you will likely be able to learn another one faster before you can start writing awesome programs and apps you need to learn the basic rules of the programming language you chose for the task tip a program is a set of instructions written in a programming language for the computer to execute we usually write the code for our program in one or multiple files for example this is a line of code in python a very popular programming language that shows the message hello world print hello world but if we write the same line of code in javascript a programming language mainly used for web development we will get an error because it will not be valid to do something very similar in javascript we would write this line of code instead console log hello world visually they look very different right this is because python and javascript have a different syntax and a different set of built in functions tip built in functions are basically tasks that are already defined in the programming language this lets us use them directly in our code by writing their names and by specifying the values they need in our examples print is a built in function in python while console log is a function that we can use in javascript to see the message in the console an interactive tool if we run our code in the browser examples of programming languages include python javascript typescript java c c c php go swift sql and r there are many programming languages and most of them can be used for many different purposes tip these were the most popular programming languages on the stack overflow developer survey 2022 the 14 most popular programming languages among all respondents of the stackoverflow developer survey 2022 it s a yearly survey that collects information about popular technologies and trends in the developer community there are many other programming languages hundreds or even thousands but usually you will learn and work with some of the most popular ones some of them have broader applications like python and javascript while others like r have more specific and even scientific purposes this sounds very interesting right and we are only starting to talk about programming languages there is a lot to learn about them and i promise you that if you dive deeper into programming your time and effort will be totally worth it awesome now that you know what programming is and what programming languages are all about let s see how programming is related to binary numbers programming and binary numbers when you think about programming perhaps the first thing that comes to your mind is something like the below image right a sequence of 0 s and 1 s on your computer binary numbers are 0 and 1 programming is indeed related to binary numbers 0 and 1 but in an indirect way developers do not actually write their code using zeros and ones we usually write programs in a high level programming language a programming language with a syntax that recognizes specific words called keywords symbols and values of different data types basically we write code in a way that humans can understand for example these are the keywords that we can use in python false class from or none continue global pass true def if raise and del import return as elif in try assert else is while async except lambda with await finally nonlocal yield break for not every programming language has its own set of keywords words written in english these keywords are part of the syntax and core functionality of the programming language but keywords are just common words in english almost like the ones that we would find in a book that leads us to two very important questions how does the computer understand and interpret what we are trying to say where does the binary number system come into play here the computer does not understand these words symbols or values directly when a program runs the code that we write in a high level programming language that humans can understand is automatically transformed into binary code that the computer can understand process of transforming a program into binary code this transformation of source code that humans can understand into binary code that the computer can understand is called compilation according to britannica a compiler is defined as computer software that translates compiles source code written in a high level language e g c into a set of machine language instructions that can be understood by a digital computer s cpu britannica also mentions that the term compiler was coined by american computer scientist grace hopper who designed one of the first compilers in the early 1950s some programming languages can be classified as compiled programming languages while others can be classified as interpreted programming languages based on how to they are transformed into machine language instructions however they all have to go through a process that converts them into instructions that the computer can understand awesome now you know why binary code is so important for computer science without it basically programming would not exist because computers would not be able to understand our instructions now let s dive into the applications of programming and the different areas that you can explore real world applications of programming programming has many real world applications in basically every industry that you can imagine programming has many different applications in many different industries this is truly amazing because you can apply your knowledge in virtually any industry that you are interested in from engineering to farming from game development to physics the possibilities are endless if you learn how to code let s see some of them i promise you they are amazing front end web development front end web developers develop the parts of websites and web applications that users can see and interact with if you learn how to code you can use your programming skills to design and develop websites and online platforms front end web developers create the parts of the websites that users can see and interact with directly for example right now you are reading an article on freecodecamp s publication the publication looks like this and it works like this thanks to code that front end web developers wrote line by line tip if you learn front end web development you can do this too the html and css code for freecodecamp s home page this is a preview of the code in chrome developer tools front end web developers use html and css to create the structure of the website these are markup languages which are used to present information and they write javascript code to add functionality and interactivity if you are interested in learning front end web development you can learn html and css with these free courses on freecodecamp s youtube channel learn html5 and css3 from scratch full course learn html css full course for beginners frontend web development bootcamp course javascript html css introduction to responsive web design html css tutorial you can also learn javascript for free with these free online courses learn javascript full course for beginners javascript programming full course javascript dom manipulation full course for beginners learn javascript by building 7 games full course tip you can also earn a responsive web design certification while you learn with interactive exercises on freecodecamp back end web development back end web developers develop servers and databases to handle everything that runs behind the scenes to make more complex web applications work correctly more complex and dynamic web applications that work with user data also require a server this is a computer program that receives requests and sends appropriate responses they also need a database a collection of values stored in a structured way back end web developers are in charge of developing the code for these servers they decide how to handle the different requests how to send appropriate resources how to store the information and basically how to make everything that runs behind the scenes work smoothly and efficiently a real world example of back end web development is what happens when you create an account on freecodecamp and complete a challenge your information is stored on a database and you can access it later when you sign in with your email and password a freecodecamp interactive challenge this amazing interactive functionality was implemented by back end web developers tip full stack web developers are in charge of both front end and back end web development they have specialized knowledge on both areas all the complex platforms that you use every day like social media platforms online shopping platforms and educational platforms use servers and back end web development to power their amazing functionality python is an example of a powerful programming language used for this purpose this is one of the most popular programming languages out there and its popularity continues to rise every year this is partly because it is simple and easy to learn and yet powerful and versatile enough to be used in real world applications tip if you are curious about the specific applications of python this is an article i wrote on this topic javascript can also be used for back end web development thanks to node js other programming languages used to develop web servers are php ruby c and java if you would like to learn back end web development these are free courses on freecodecamp s youtube channel python backend web development course with django node js and express js full course full stack web development for beginners full course on html css javascript node js mongodb node js express course build 4 projects tip freecodecamp also has a free back end development and apis certification mobile app development mobile app developers design and develop the mobile apps we use every day mobile apps have become part of our everyday lives i m sure that you could not imagine life without them think about your favorite mobile app what do you love about it our favorite apps help us with our daily tasks they entertain us they solve a problem and they help us to achieve our goals they are always there for us that is the power of mobile apps and you can be part of this amazing world too if you learn mobile app development developers focused on mobile app development are in charge of planning designing and developing the user interface and functionality of these apps they identify a gap in the existing apps and they try to create a working product to make people s lives better tip regardless of the field you choose your goal as a developer should always be making people s lives better apps are not just apps they have the potential to change our lives you should always remember this when you are planning your projects your code can make someone s life better and that is a very important responsibility mobile app developers use programming languages like javascript java ...
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