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JavaScript | Blog

JavaScript

JavaScript tips, tricks and tutorials

14 articles

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In JavaScript, numbers prefixed with a `0` are parsed as octal numbers

We're so accustomed to the decimal system (base-10) that it's easy to overlook this nuance. When you write 010, you might intuitively think it's ten, but JavaScript sees it as 1 * 8^1 + 0 * 8^0 = 8

October 26, 20241 min1212

JavaScriptOctal

To accurately check if a value is an object in JavaScript

Using Object.getPrototypeOf() provides a more robust and precise way to check if a value is an object, making it ideal for advanced type checking in JavaScript.

September 30, 20242 min1529

JavaScriptObjects

In JavaScript understanding shallow copies and their implications on re-renders is essential

By creating a new array (or object) with a new reference when updating state, you help React to efficiently detect changes and manage re-renders.

July 10, 20243 min1204

JavaScriptShallow Copy

Understanding stopPropagation in JavaScript

In JavaScript, the stopPropagation method is a powerful tool for managing event flow within the DOM

June 19, 20243 min1695

JavaScriptDOM

25 Important JavaScript Interview Questions (Basic to Advanced)

25 important JavaScript interview questions for 2024, covering a range of topics from basic to advanced

June 5, 20245 min1223

JavaScriptInterview

The difference between `Date()` and `new Date()` in JavaScript

In summary, `Date()` returns a string of the current date and time, while `new Date()` creates an instance of the `Date` object

May 30, 20242 min1682

JavaScriptDate

JavaScript uses a garbage collection mechanism to manage memory automatically

In JavaScript, the garbage collector automatically handles memory management, including the cleanup of local variables when they go out of scope.

May 20, 20243 min1051

JavaScriptMemory

Use a JavaScript code linter to enforce coding standards and catch errors early

ESLint will analyze your JavaScript code, applying the rules specified in your .eslintrc.js file, and report any errors or warnings it finds.

May 10, 20241 min942

JavaScriptESLint

2 Ways to Remove a Property from an Object in JavaScript

In summary, the first method is generally considered better practice, especially if you want to follow the principle of immutability.

February 23, 20242 min1143

JavaScriptObjects

Get card type with JavaScript

You can determine the type of a credit card based on its card number using JavaScript.

November 7, 20231 min1112

JavaScriptCredit Card

JavaScript tasks for beginners

Looking for JavaScript practice tasks? Presenting some JavaScript Tasks for beginners!

November 18, 20226 min994

JavaScriptBeginner

How to run multiple asynchronous tasks and wait until they've completed before executing the remaining code

The solution is to map each element of an array to a promise, and pass the resulting array of promises to Promise.all. We have to use Promise.all because the await keyword only works on a single promise.

October 5, 20221 min970

JavaScriptAsync

JavaScript - extract duplicate items from array then delete all duplicates

How can I filter this array and remove duplicates? I know solutions. Extract duplicate items from array then delete all duplicates

November 1, 20211 min1084

JavaScriptArrays

Changing the html view of sites with javascript codes

The first ever blog post is here. It might be a good idea to update this post with some more relevant content.

May 25, 20191 min1081