Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles by Ayush Gupta
Page 2 of 44
Where is _.pluck() in lodash version 4?
The _.pluck() method was removed from lodash version 4 because it provided the same functionality as _.map(). This change was part of lodash's effort to reduce redundancy and improve consistency. What _.pluck() Did In lodash 3.x, _.pluck() extracted property values from a collection of objects: // Lodash 3.x syntax (no longer available) _.pluck(objects, 'propertyName') Replacement: Using _.map() In lodash 4+, use _.map() with a property path string to achieve the same result: const _ = require('lodash'); const objects = [{ 'a': 1 }, { 'a': 2 }, { 'a': 3 }]; ...
Read MoreWhat is the replacement of lodash pluck() method?
Lodash's pluck() method was removed in version 4.0 because it provided the same functionality as the map() method. The pluck() method was used to extract property values from objects in an array. Using _.map() as Replacement You can replace _.pluck() with _.map() using the property shorthand syntax: import _ from 'lodash'; const objects = [{ 'a': 1 }, { 'a': 2 }, { 'a': 3 }]; console.log(_.map(objects, 'a')); [1, 2, 3] Using Native Array.map() For modern JavaScript, you can use the native Array.map() method without lodash: const objects ...
Read MoreDifference between application/x-javascript and text/javascript content types?
When serving JavaScript files, choosing the correct MIME type is crucial for proper browser handling. Let's explore the differences between these content types and understand which one to use. text/javascript (Obsolete) The text/javascript content type was used in the early days of HTML but is now obsolete according to RFC 4329. While browsers still support it for backward compatibility, it should not be used in modern applications. // Server header (obsolete) Content-Type: text/javascript application/x-javascript (Experimental) application/x-javascript was an experimental content type, indicated by the "x-" prefix. The "x-" denotes non-standard or experimental MIME ...
Read MoreWhat is the use of sentry in javascript?
Sentry is a complete JavaScript debugging and monitoring tool that helps developers track errors and performance issues in production applications. It provides real-time error tracking, performance monitoring, and detailed debugging information to improve application reliability. Key Features of Sentry Record environment and usage details to recreate and fix bugs See the error and stack trace previously only visible in user's debug console Apply source maps automatically to convert minified, compiled, or transpiled code back to its original form Mobile app reporting support ...
Read MoreJasmine.js comparing arrays
In Jasmine.js, arrays can be compared in two different ways depending on your testing needs: Reference equality - checking if two variables refer to the same array object in memory Content equality - checking if arrays contain the same elements, even if they are different objects Using toBe() for Reference Equality The toBe() matcher checks whether two arrays are the exact same object in memory. This is useful when you want to verify that two variables reference the same array instance. describe("Array Reference Equality", () => { ...
Read MoreWhat is the difference between `new Object()` and object literal notation in JavaScript?
JavaScript provides two main ways to create objects: new Object() constructor and object literal notation {}. While both create objects, they have important differences in syntax, performance, and flexibility. Object Literal Notation Object literal notation uses curly braces {} to create objects directly with properties: let person = { name: 'Ayush', age: 25, city: 'Delhi' }; console.log(person.name); console.log(person); Ayush { name: 'Ayush', age: 25, city: 'Delhi' } Using new Object() Constructor The new Object() constructor creates an ...
Read MoreWhat is JSlint error "missing radix parameter" in JavaScript?
The parseInt function in JavaScript has the following signature: parseInt(string, radix); Where the parameters are: string − The value to parse. If this argument is not a string, then it is converted to one using the ToString method. Leading whitespace in this argument is ignored. radix − An integer between 2 and 36 that represents the radix (the base in mathematical numeral systems) of the string. The Problem: Omitting the Radix Parameter If the radix parameter is omitted, JavaScript assumes the following: If the string begins ...
Read MoreWrite the dependencies of backbone.js in javascript?
Backbone.js is a lightweight JavaScript framework that requires specific dependencies to function properly. Understanding these dependencies is crucial for setting up and working with Backbone.js applications. Hard Dependency The only hard dependency (without which Backbone.js won't work at all) is Underscore.js. Underscore is a JavaScript library that provides a whole mess of useful functional programming helpers without extending any built-in objects. // Including Underscore.js is mandatory Optional Dependencies There are other dependencies required as you proceed to use more advanced features of Backbone.js: jQuery or ...
Read MoreWhat are the differences between lodash and underscore?
Lodash and Underscore are both utility libraries that make JavaScript easier by providing utils that make working with arrays, numbers, objects, strings, etc. much easier. These libraries are great for: Iterating arrays, objects, & strings Manipulating & testing values Creating composite functions They are both functional libraries. Lodash is a fork of Underscore, and still follows Underscore's API enough to allow it to serve as a drop-in replacement. But under the hood, it's been completely rewritten, and it's also added a number of features and functions that ...
Read MoreQuery-string encoding of a Javascript Object
The query string is made up of query parameters and used to send data to the server. This part of the URL is optional and needs to be constructed by the developer. This can be done using a native method called encodeURIComponent(). The encodeURIComponent() function encodes a Uniform Resource Identifier (URI) component by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character. Using Object.keys() and map() Using ES6 features, objects can be query string encoded by combining Object.keys(), map(), and join() methods: let ...
Read More