JavaScript is the programming language of HTML and the Web.JavaScript is convenient to learn.
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| Javascript |
Brendan Eich is an American technologist and creator of the JavaScript programming language.
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| Brendan Eich |
Why Study JavaScript?
1.JavaScript is one of the three languages all web developers ought to learn:1. HTML to outline the content material of web pages
2. CSS to specify the sketch of internet pages.
3 JavaScript to application the behavior of web pagesWeb pages are now not the only place where JavaScript is used. Many computing device and server packages use JavaScript. Node.js is the fantastic known. Some databases, like MongoDB and CouchDB, also use JavaScript as their programming language.
function exampleFunction() {
var x = "declared inside function";
// x can only be used in
exampleFunction
console.log("Inside function");
console.log(x);}
console.log(x); // Causes error
How much does a Javascript Developer make in the United States?
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| Coder |
The common revenue for a Javascript Developer is $113,643 per year in the United States. Salary estimates are based totally on 1,184 salaries submitted anonymously to Indeed by Javascript Developer employees, users, and gathered from past and present job advertisements on Indeed in the past 36 months. The typical tenure for a Javascript Developer is much less than 1 year.The most-used applied sciences in high-income nations included, in descending order, Java, Python, JavaScript, C#, HTML, Android, jQuery, and PHP; in the rest of the world, the top-ranked blanketed (also in descending order) JavaScript, Java, Android, C#, PHP, jQuery, HTML, and Python. So no stark variations here, however there’s on the other hand ample variant to hold matters interesting.
Major difference between java and javascript?
- Java code must be compiled, and
JavaScript code is all-text.
- Each language requires
different plug-ins.
- JavaScript code is run on a
browser only, while Java creates applications that run in a virtual
machine or browser.
- Java is an OOP (object-oriented
programming) language, and JavaScript is specifically an OOP scripting
language.
How to write hello world in JavaScript?
<html>
<body>
<script>
<!--
document.write("Hello World!")
//-->
</script>
</body>
</html>
What kind of field JavaScript is worked?
1.Web Development:
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| Javascript |
JavaScript is a consumer scripting language which is used for developing web pages. It is a standalone language developed in Netscape. It is used when a webpage is to be made dynamic and add extraordinary effects on pages like rollover, roll out and many kinds of graphics. It is mostly used by means of all web sites for the cause of validation. In addition to validations, it supports exterior functions like PDF documents, running widgets, helping for flash functions etc. It can additionally load content material into a report every time the consumer requires it except even reloading the entire page.
2.Web Applications:
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| Programmer |
With technology browsers and private computers have extended to an extent that a language was once required to create robust net applications. When a consumer explores a map in Google Maps then the user just wants to click and drag the mouse. All exact view is visible by way of simply a click. This is possible due to JavaScript. It interacts with the browser besides sending messages to and fro to the servers. JavaScript uses Application Programming Interfaces(APIs) that provide greater powers to the code.
3.Presentations:
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| presentations |
JavaScript additionally affords the facility of developing displays as a website. JavaScript affords RevealJS and BespokeJS libraries to construct a web-based slide deck. Reveal.js creates some of the most stunning and interactive decks the usage of HTML. A person can effortlessly insert nested slides. Even if the user is no longer conscious of programming language then they can without difficulty build a web page with so a great deal assist online. These shows are contact optimized and work superb with cell devices, phones, and tablets. With all this JavaScript also gives distinct transition styles, themes, and slide backgrounds. It helps all CSS coloration formats. JavaScript also affords Bespoke.js plugin with a broad variety of features. These consist of responsive scaling, animated bullet lists, and syntax highlighting for code examples. It offers themes which are polished and no longer too flashy. The quickest way to start Bespoke.js is using a generator. It lets in the consumer to set titles to your presentation and go thru a set of questions to get the plugins required.
4.Server Applications:
Node JS is built on Chrome’s Javascript runtime for building quick and scalable community applications. It uses event-driven, light-weight and efficient applications which are to be allotted over the systems with the help of a server. Javascript is used to manage HTTP requests and generate contents. When a person is writing thick functions in JavaScript on the consumer then a person may also even write the logic in JavaScript on the server so that cognitive leaps can be performed from one language to the other.
5.Web Servers:
Using Node JS a internet server can be created. The benefits of Node JS are that it is event-driven and would now not wait for the response of the preceding call. It moves to the subsequent name and takes gain of events to get notifications when a response is acquired for a previous call. The servers constructed on Node JS are very speedy and do not use buffering and transfers chunks of data. In addition to this, it is single threaded with tournament looping which is used in a non-blocking way. The HTTP module can help in developing a server by using the use of the createServer() method. This method is executed each time anybody tries to get right of entry to port 8080. In response to this, the HTTP server should show HTML and have to be blanketed in HTTP header. It can be mounted without problems through typing ‘npm deploy -g http-server’ and it can be started via typing http-server command.
How to write a program to add two number in
javascript?
<!doctype html>
<html>
<head>
<script>
function
add(){
var a,b,c;
a=Number(document.getElementById("first").value);
b=Number(document.getElementById("second").value);
c= a + b;document.getElementById("answer").value=
c
;}
</script>
</head>
<body>Enter the First number : <input
id="first">
Enter the Second number: <input
id="second">
<button
onclick="add()">Add</button>
<input
id="answer">
</body>
</html>
Things to remember while writing the
javascript?Always stay conservativeAvoid fat views
View.prototype.onClick = function () {
var otherThings;
if (this.model.canRemove()) {
this.model.remove();?
otherThings = this.model.getOtherThings();
otherThings.forEach(function (thing) {
thing.remove();
});
}
};
Make your errors informative
var fn = function (value) { if (value !== "") {
model.set(value);
doSomethingElse();
} else {
throw new Error("fn: empty value");
}
};
Avoid logic in if statements
var makeWords = function () {
if (model.getType() === "cat") {
model.setWord("meow");
model.sayIt();
} else if (model.getType() === "dog") {
model.setWord("bark");
model.saySomething();
model.foo();
}
};
JavaScript questions asked for interview?
- List some features of JavaScript.
- List some of the advantages of JavaScript.
- Define a named function in JavaScript.
- Name the types of functions.
- Can an anonymous function be assigned to a variable?
- If we want to return the character from a specific index which method is used?
- How to write a hello world example of JavaScript?
- Is JavaScript case sensitive language?
- What is the use of window object?
- How to write a comment in JavaScript?
- What is the difference between == and ===?
- How to create objects in JavaScript?
- What does the isNaN() function?
- What is the output of "10"+20+30 in JavaScript?
- Difference between Client side JavaScript and Server side JavaScript?
- What is the real name of JavaScript?
- Are Java and JavaScript same?
- What is the difference between View state and Session state?
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