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Javascript Articles
Page 183 of 534
How to check the current runtime environment is a browser in JavaScript?
A runtime environment is an environment where your code will be executed. It tells what global objects your code can access and it also impacts its result. A JavaScript code can run in different types of environments some of them are Node.js, Service Workers, or in a web browser. So, to start coding in JavaScript, you don’t have to install any additional software. Each web browser comes with a JavaScript engine. You can simply run scripts you write inside any browser but it ensures that it follows all the rules of the ECMAScript (ES6) functionality.Here we will detect in which ...
Read MoreHow do you reverse a string in place in JavaScript?
In this tutorial, we will learn to reverse a string in place in JavaScript. How to reverse a string is one of the most popular questions asked in the interview of freshers. It’s an easy task but the interviewer can be tricky and make the same question difficult for you. For example, what if the interviewer asks you to write a pseudo code to reverse a string in place without using the extra space? You should have an answer ready in your mind for this kind of tricky question.There are lots of ways to reverse a string. As developers develop ...
Read MoreHow do you get a timestamp in JavaScript?
In this tutorial, we will learn to get a timestamp in JavaScript. It never happens that software developers or application developers don’t require to play with date and time. In many situations, they are required to play with date and timestamp. For example, to show the time on the user’s dashboard, save the time of an operation in the database.Now, let’s understand what the timestamp is? The timestamp is the total number of milliseconds from the 1st January 1970 from when UNIX epochs begin. Using the timestamp, we can extract the date, day, year, month, hours, minutes, second, milliseconds, etc.So, ...
Read MoreHow do you find out the caller function in JavaScript?
In this tutorial, we will learn to find out the caller function in JavaScript. The function is the reusable code, and users can call it from anywhere. But sometimes, they need to know who is the caller function to perform some operation.For example, suppose that we can call any single function from another 2 to 3 functions, and we need to perform some operation according to the caller function. Users can understand this scenario by the below code example.function func3 () { If ( caller is func2() ) { // code for some operation } else if ( caller is func1() ){ // code for some different operation } ...
Read MoreHow do you access the matched groups in a JavaScript regular expression?
This tutorial will teach us to access the matched groups in JavaScript regular expression. The regular expression is the sequence of the character, also called the RegEx, and it is useful to match specific patterns in the string.There can be more than one match for the specific pattern in the string. To get the occurrence of all matches, we have explained the different methods below in this tutorial.We will also see the various usage of the regular expression in this article.Use the ‘g’ flag while creating the RegexWhen we add ‘g’ as the modifier in the regular expression, it searches ...
Read MoreHow does JavaScript 'return' statement work?
In this article, we will learn how to work with a return statement in JavaScript. A specific value from the function is returned to the function caller using the return statement. Whenever the return statement is run, the function will stop. The code that follows the return statement won't be available, due to which it is the last statement in a function.Using the return statement, we may return object types, including functions, objects, arrays, and primitive values like Boolean, integer, and string.By using the return statement, we can also return many items. Immediate action is not viable. To return several ...
Read MoreHow does JavaScript .prototype work?
In this example, we will learn how the prototype works in JavaScript. It is rare if a JavaScript developer doesn’t use the objects while developing the functions, and the objects can make a lot of work easy for developers.The prototype is also the advanced concept associated with the objects in JavaScript. Many of you have heard about the prototypes for the first time but don’t worry. We will cover all things about the prototypes in this tutorial.What does the prototype do?The prototype is the object created for every function class when the program starts execution. However, it depends on the ...
Read MoreHow do I print Unicode characters in the console using JavaScript?
In this article, we will learn how to print Unicode characters in the console using JavaScript. No matter the platform, the software, or the language, Unicode assigns a unique number to each character.Most writing systems' characters are defined by the universal character set known as Unicode, which also assigns each character a unique number (code point). A unit of data called an abstract character (or character) is used to organize, manage, or represent textual data.Most of the modern languages' letters, punctuation marks, diacritical markings, mathematical symbols, technical symbols, arrows, emoji, and other symbols are all included in Unicode.These are different ...
Read MoreHow do I display image in alert/confirm box in JavaScript?
In this tutorial, we will learn to display the image in the alert or confirm box in JavaScript. The alert() is the JavaScript method that displays the alert or confirms box on the top center of the screen when you invoke it.As a programmer and user, you have seen on many websites that they ask you for confirmation in the dialog box before you delete any precious thing in your user's account. Also, the alert box can be helpful to show some information when a user comes into the web page or a message.So, the default alert box can have only ...
Read MoreHow do I declare a namespace in JavaScript?
A namespace is a programming concept that gives identifiers (names of types, functions, variables, etc.) scope to avoid name conflicts. For instance, a program may need to use the same variable name in many contexts. In such a case, namespaces will separate these contexts so that the same identifier may be utilized in many namespaces.The initialization and application of namespaces in JavaScript will be covered in this tutorial. A namespace is not by default available in JavaScript. Constructing a global object that contains all functions and variables, the JavaScript Namespace feature may be repeated. Because numerous libraries and components are ...
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