Atta Ur Rehman Shah

Learn how to use the typeof operator to determine if a variable is a string in JavaScript.

Learn how to use the typeof operator to check if a variable exists or is defined in JavaScript.

Learn how to use the equality operator == to check if a variable is undefined or null in JavaScript.

Learn how to use the Number.isInteger() method to check if a variable is an integer in JavaScript.

Learn how to use Number.isFinite(), Number.isNaN(), and typeof operator to check if a variable is a number in JavaScript.

Learn how to use the toLocaleString() method of the date object to convert a date into another time zone in JavaScript.

Learn how to use the toUTCString() method to get the current date and time in UTC in JavaScript.

Learn how to use the getTime() method of the date object to get a UTC timestamp in JavaScript.

Learn how to use the map() and trim() methods to trim all strings in an array using JavaScript.

Learn how to use the forEach() and map() methods to update all elements in an array using JavaScript.

Learn how to use the date object constructor to convert milliseconds to a date in JavaScript.

Learn how to use the getFullYear() and setFullYear() methods of the date object to add years to date in JavaScript.

Learn how to use the getMonth() and setMonth() methods of the date object to add months to date in JavaScript.

Learn how to use the getSeconds() and setSeconds() methods of the date object to add seconds to date in JavaScript.

Learn how to use the getMinutes() and setMinutes() methods of date object to add minutes to date in JavaScript.

Learn how to use the getTime() and setTime() methods of date object to add hours to date in JavaScript.

A quick guide to learning how to get a list of all time zones in JavaScript.

A short guide to learning how to use the Object.keys() method to get the length of a JavaScript object.

A quick guide to learning how to read a text file into an array using Node.js.

Learn how to use the copyFile() method from the native fs module to copy a file in Node.js.

Learn how to use the native fs module to check if a file contains a string in Node.js.

Learn how to use the glob open-source Node.js module to find all the files that match a certain paterrn.

Learn how to use the URL object to remove query string from a URL using JavaScript.

A quick guide to learning how to push an object to an array using the Array.push() method in JavaScript.

A quick guide to Learning how to use the JavaScript Internationalization API to format a number as a currency string.

A short guide to learning how to make an HTML number input field always display 2 decimal places using JavaScript.

A quick guide to learning about different ways to format a double or float number to two decimal places in Java.

Learn how to use the File System (fs) module in Node.js to replace all occurrences of a string in a file.

A short guide to learning how to check if a checkbox is checked in using JavaScript and jQuery.

A quick guide to learning how to check if an element is hidden or visible in DOM using JavaScript.

A short guide to learning about different ways to get the previous page URL using JavaScript.

Learn how to use the window.location property to check if the URL contains a hash or fragment component in JavaScript.

A short guide to learning how to remove the hash from the URL (window.location) using HMTL5 History API methods in JavaScript.

A quick guide to learning how to pass a JSON object or an array as a parameter in HTTP requests in JavaScript.

A quick guide to learning how to detect browser or tab closing using JavaScript.

A short guide to learning how to sort an array of objects by a property value in JavaScript.

A quick guide to learn about different ways to sort an object's properties by their values in JavaScript.

A quick guide to learning how to validate an email address in JavaScript and Node.js using regular expressions.

A quick guide to learning how to upsert a document in Mongoose.

A quick guide to learning how to use the $regex operator to find documents that contain a specific string using Mongoose.

A quick guide to learning how to increment or decrement a number value in Mongoose.

A quick guide to learning how to select distinct values in a MongoDB collection using Mongoose.

A quick guide to learning how to use $gte and $lte operators to query documents at a specific date in Mongoose.

A quick guide to learning how to use the $unset operator to remove a specific key from a MongoDB document using Mongoose.

A quick guide to learning how to use the $ne operator to query documents where the value is not null in Mongoose.

A quick guide to learn about $push and $pull operators in Mongoose to push and pull items from an array field.

Learn how to delete documents from a MongoDB collection using Mongoose methods like deleteOne, deleteMany, findOneAndDelete, and findByIdAndDelete.

Learn how to update documents in Mongoose using save, updateMany, updateOne, and findOneAndUpdate methods.

A quick guide to learning about different ways to find one and more documents from a MongoDB collection.

An introduction to Mongoose queries and how to use the Query object to find, update and delete documents from a MongoDB collection.