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Articles by Aman Kumar
Page 4 of 4
How can you detect the version of a browser using Javascript?
In this article, we are going to discuss how to detect the version of a browser using JavaScript. These days, most browsers are JavaScript−enabled. But still, there are some browsers that don’t support JavaScript; or, some versions of some browsers don’t support certain features of JavaScript. Therefore, in certain instances, there is a need to know the details of the client’s web browser so that the applications can deliver appropriate content. Detecting the Version of a Browser You can detect the details of the current browser using navigator.appName and navigator.appVersion properties. To detect the version of the browser in the ...
Read MoreHow to deserialize a JSON into Javascript object?
Serialization is the process of converting an object such that it is transferable over the network. In JavaScript usually we serialize an Object into the JSON (or JavaScript Object Notation) format. To reserialize a JSON into a JavaScript object, we need to use the method JSON.parse(). JavaScript object notation is used to exchange data to or from a web server of the rest full API. The data we get from a web server is always a string variable, in order to use it we need to parse it with JSON.parse() which will return a JavaScript object or array object. Following ...
Read MoreHow do I pass an event handler to a component in ReactJS?
Reactjs is an open source javascript library, used in web development to build interactive pages in websites. Reactjs provides user friendly, declarative, and precise. Components Components are individualistic and reusable bits of code in react js. It helps to create separate files for our class and function. In general components are two types− class components and function components. Event Handlers Event handlers define what action to be performed when an event is fired or triggered. Events in react preceded with “on” for example onClick, and onFocus. Event handler in react is just like DOM in HTML, react has also same handler ...
Read MoreWhat is the importance of '+' operator in type conversion in JavaScript?
Java script is an autonomous type of language most of the time operation directly convert the value of their write type. But there are also cases in which we need to do explicit type conversion.While Java script provides many ways to convert data from one form to another. But there are two most common types of conversion. converting the value to a string. converting a value to a number. Implicit conversion There are various operators and functions in the JavaScript that automatically convert values to the right type like the alert() function in JavaScript accepts any value and ...
Read MoreWhat is the relation between 'null' and '0' in JavaScript?
It looks very odd to hear that because in mathematics if we have two numbers i.e a and b and if a is not less than b then the possible scenarios are either a is greater than or equal to b. But in the case of null and “0” null is not greater than "0" or equal to "0" but greater than or equal to "0". (null>=0) In JavaScript "0" is equal to false because "0" is a type of string when it is tested for equality the automatic type conversion of JavaScript will come into effect and convert the ...
Read MoreHow to invert an object in JavaScript?
Invert means to print the value in reverse order. In a technical word, we can say that suppose we have taken an object of the array. The object takes the value in key-value pairs and prints the value in value-key pairs. The _.invert() function belongs to the underscore.js a javascript library that provides versatile functions. This is used to copy an object where the object key is converted into value and the object is converted into the key. This means the [key, value] of the object is reversed. Syntax Following is the syntax of the _.invert() function − _.invert(object) ...
Read MoreHow to get the first n values of an array in JavaScript?
In this article we are going to discuss how to get the first n values of an array using JavaScript. First, n value − to find the elements from the first index to n (n is the given number or given index) suppose you have given the n value as 5 the returned elements will be from index 0 to 5. Using the _.first() function To get the first n elements of an array we have many logical methods. But underscore.js provides the _.first() function. Which will directly or in a simple way gives the output. Note − if we did not mention ...
Read MoreHow do find out all elements that match a specific condition in JavaScript?
We can find the specific condition with the help of the _.whare() function. The _.where() belongs to underscore.js a javascript library that provides versatile functions. The _.where() is a function used to find the specific element according to the given conditions. Suppose you want to find all the user details of the class and then apply the _.where() function to the list of all the sections and pass the condition as the section name. So the name of all the users with the specific condition will be returned. Syntax _.where( list, [predicate], [context] ) The function accepts three-argument as ...
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