6 Questions
Provide an example of creating a module in JavaScript and using it in a Node.js file.
One way to create a module in JavaScript is by using 'module.exports' to export functions or data. For example, creating a module 'math.js' containing a function to add numbers, and then using 'require' in a Node.js file to use this module.
Explain the concept of asynchronous programming in JavaScript with an example.
Asynchronous programming in JavaScript allows tasks to run separately from the main program flow, ensuring non-blocking behavior. An example of this is using setTimeout() to delay the execution of a function.
Describe how to find elements in the DOM using JavaScript.
In JavaScript, elements in the DOM can be found using methods like getElementById(), getElementsByClassName(), querySelector(), and querySelectorAll().
Explain the key differences between JSON and String Object in JavaScript.
JSON is a data interchange format used for storing and exchanging data, while String Object is a built-in object in JavaScript used for manipulating strings.
Discuss the significance of JQuery selectors in web development and provide an example.
JQuery selectors are used to select and manipulate HTML elements, providing a powerful way to interact with the DOM. For example, $('p') selects all
elements on a webpage.
Explain the concept of traversing the DOM tree in JQuery and provide a practical example.
Traversing the DOM tree in JQuery involves moving up and down the HTML structure to find elements. For example, $('li').parent() selects the parent element of all elements.
Test your knowledge on various JavaScript concepts including bugs and error handling, modules, DOM manipulation, asynchronous programming, creation and use of modules in Node.js, and file operations in a Node.js file. Each topic includes examples for better understanding.
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