Basics Of Javascript For Beginners – JavaScript is a high-level, dynamic, and interpreted programming language. It is used to add interfaces and other dynamic elements to websites.
A console in JavaScript is a tool used for debugging and testing purposes. This allows developers to save data to the browser console for viewing. This can be useful for checking the value of variables, checking the results of functions, and tracking errors in code.
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These methods can be used directly in JavaScript code and the results can be viewed in the browser console by opening the developer tools in most modern browsers.
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Variables are used to store values in JavaScript. You can declare variables with the word “given”:
Var: This is the basic way to declare variables in JavaScript. This is a bounded function, which means it can only be accessed within the page where it is declared.
Given: This type of variable was introduced in ECMAScript 6 and is block scoped. This means that the variable is accessible within the block of code in which it is declared.
Const: This type of variable is also block scoped and was introduced in ECMAScript 6. The difference between const and let is that const cannot be reassigned after it has been declared.
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It is important to note that a value stored inside a variable declared with const is also mutable, meaning that its properties can be changed but it cannot be completely reassigned.
In JavaScript, you can add comments to your code to explain what it does or to temporarily ignore certain parts of the code. There are two types of comments: single-line comments and multi-line comments.
In JavaScript, variables have dynamic types and can change their type based on a given value. The type operator can be used to check the type of a variable.
Conditional statements are used to execute different blocks of code based on conditions. The if-else statement is the most common type of conditional statement in JavaScript. Here is an example:
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These are just some of the basics of JavaScript. There’s a lot to learn, but these basics will give you a good foundation to start building your skills.
In addition to these two loops, there is a do-while loop, which is similar to the while loop, but differs slightly in the way it checks the condition. Here is an example:
These are the basics of JavaScript loops. You can use them to repeat a block of code multiple times based on conditions.
An array in JavaScript is a data structure that stores values. You can access individual values of an array by specifying their index numbers. Arrays are declared using square brackets [] and items are separated by commas.
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Here are the most commonly used array methods in JavaScript. You can use these methods to manipulate arrays and perform various operations on them.
In JavaScript, an object is a collection of key-value pairs that stores data. Objects are declared using curly braces and parentheses and values are separated by colons.
Objects are widely used in JavaScript to store data and represent objects in the real world. You can use objects to create complex data structures and data management. You are very skilled.
IndexOf: Returns the index of the first occurrence of the specified value, or -1 if not found.
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These are just a few of the methods available in JavaScript, each with its own specific use case. Understanding and using these methods can greatly simplify manipulating strings in your code.
JavaScript adds class syntax with ECMAScript 6 (ES6) as a way to write reusable code and create objects. A class is a blueprint for creating objects with the same properties and methods.
In the example above, the Person class has two properties: name and age, and a greeting method that prints the greeting text.
You can extend a class to create subclasses and inherit properties and methods from the parent class:
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In the example above, the Student class extends the Personal class and adds new key features and study methods. The super keyword is used to call the constructor of the parent class and pass the required properties.
Classes in JavaScript provide an organized and reusable way of writing code, making it easy to maintain and extend your codebase.
A regular expression (RegExp) is a pattern that specifies a set of strings. JavaScript provides built-in support for regular expressions with RegExp objects.
In this example, we define the line “Hello, world!” and the regular expression /hello/. We use the test() method of the RegExp object to test whether a string matches a pattern. A Boolean value indicating whether the result string matches the pattern.
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You can also use the match() method of the String object to find all matches of a regular expression in a string:
In this example, we add the g (global) flag to the pattern to find all matches in the string instead of the first match. The result string is an array of strings containing all matches of the pattern. You start with a blank canvas and some basic raw materials. You use a combination of science, art and craft to determine what to do with them.” (Andrew Hunt) Why JavaScript?
Welcome to the fifth and final day of your web development short course! Today, we’ll touch on JavaScript and try to improve it a bit to learn more about the third and final pillar of the web.
JavaScript, as you know, is ubiquitous in today’s software development world. It is the foundation of frontend web development and a key component in frameworks like ReactJS, Angular, and VueJS. It can help build solid backends with platforms like Nodejs, run desktop applications like Slack, Atom, and Spotify, and run on mobile phones as Progressive Web Apps (PWAs).
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In short, it’s everywhere—and for good reason. For beginners, compared to other languages like C and Java, JavaScript is generally easier to learn. When we say ‘easy’, we mean how you can go from a JavaScript novice to someone who can create professional and high-quality JavaScript code. So, in that sense, it is more accessible than other languages like C and Java.
JavaScript is also a fun and rewarding language, which is especially important when you’re just starting out in software development. Community support is excellent, so if you get stuck, there’s a good chance the problem and its solution are out there on the web.
Now that we’ve got a bird’s eye view of JavaScript, let’s get into the more technical details. JavaScript was created to add ‘life to the web’. Like HTML and CSS, JavaScript is written in plain text files with the extension .js.
As mentioned earlier, JavaScript can be used to perform many useful tasks on a page, such as validating forms, notifying users, storing data temporarily, and performing calculations—just to name a few.
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?Pro tip: Apart from its name, JavaScript has nothing to do with Java. Beginners are often confused between the two languages. Remember that Java is a completely different language that was created for different purposes (although you’ll still see it working in some website backends).
Finally, before we look at today’s journey, remember that JavaScript, like HTML and CSS (but perhaps more so), is a comprehensive language. We’re only going to learn a few that are relevant to us today, so we’ll list some great resources at the end if you want to learn more.
JavaScript is a programming language, and like most programming languages, it has some basic constructs that we’ll look at. A program in JavaScript is like a sequence of steps. Computers need detailed, step-by-step instructions to complete simple or complex tasks, similar to how we instruct strangers.
As we did for CSS, we will create a new JavaScript file called ‘script.js’ in the stock directory. Now open the index.html file, and before the closing tag (), insert this line.
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That’s what happened. We have linked our script file in our HTML. To make sure it works, write the following code in your script.js file.
Notice the dialog box at the top? That’s the first line of JavaScript, code prompt, action. Try changing the text and refreshing the data. You can also do it in CodePen below!
If you followed the last part, you have configured the script file correctly. We’re ready to write some JavaScript! Let’s consider some important concepts.
Variables are data-friendly names. ‘Human’ or ‘one head, two. Think about how you call people by their names as opposed to ‘one eye, one nose…’ and so on. Variables are simply human-friendly (and descriptive) names for pieces of data. Let’s consider an example.
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Here we define a variable called ‘Greeting’ and assign the value ‘Hello World’. It reads almost like English – ‘Greetings Hello World’ – see? Greeting now has the value ‘hello world’ in it, and can be used instead