Check the current swap space configurationUse swapon --show or free -h. If swap space is not used, swapon --show will output nothing, while free -h outputs with 0 byte for

DefinitionWhat is event bubbling? Most events attached to the DOM node do propagate (bubble / capture). In other words, when an event is triggered It first goes from the most parent

I made this post to summarize several critical practices in the PR review process based on my experience. The list includes only essential rules, rather than general ones. Feel free

In this post, I will share my coding convention for my React projects. If you think they are useful for your project especially at the initial setup stage of the

From ES6, there are Proxy and Reflect classes which allow us to customize the objects at several language levels. For example: property retrieval, assignment, iteration, function invocation, ... Lets start with

Check if a value is array type To check whether an object is array type, use Array.isArray(), instead of instanceof Array. Reason: instanceof Array does not work across realms

TLDR; With an ES6 Map, use for (const [key, value] of myMap), this is equivalent to for (const [key, value] of myMap.entries()).With an ES6 Set, use for (const

In Javascript, object's property falls into exactly one of two categories (not both, not none of them): data property, accessor property (ECMA). DefinitionRegardless of with or without your explicit definition,

How does the new operator work in Javascript, when for example, calling new MyClass(...params)? Step 1: create a new object by Object.create(MyClass.prototype).Step 2: call MyClass's

When it happens that you want to find the first pair of elements from two arrays. You would want to break the for-loop after the predicate is satisfied. The common

This post explains how javascript does when it compares two values with a relational operator ( <, >, <=, >=). If you are looking for equality comparison ( ==, ===), check this post instead.

TLDR; The list of required permissions is as follows: These include BatchCheckLayerAvailability, GetAuthorizationToken, CompleteLayerUpload, InitiateLayerUpload, PutImage, and UploadLayerPart. This is the role's detail in JSON format. { "Version": "2012-10-17", "Statement": [ { "Sid"

TLDR; With docker installed, this command can be be used to access the mysql server without installing the mysql client. docker run -it --rm mysql mysql -u <your-account>

List of various tar commands for your daily uses. Create an (uncompressed) archive.Create: tar cvf data.tar data/Extract: tar xvf data.tar2. Create and compress in xz format

The title's full phrase is Dots Per Inch versus Pixels Per Inch versus Device Dots Per Pixel. Dots Per Inch (DPI): only used for physical printing, which specifies how many

As the title suggests, what is the difference between authentication and authorization? Authentication: the process to confirm who you are.You are going to persuade the server that you are

TLDR; Here is the code export const usePrevRef = <T>(value: T) => { const currentRef = useRef<T>() const prevPref = useRef<T>() prevPref.current = currentRef.current

Everything about inotify in Ubuntu. Check current config$ sysctl fs.inotify fs.inotify.max_queued_events = 16384 fs.inotify.max_user_instances = 128 fs.inotify.max_user_watches = 65536To modify

In Javascript, in general, to check if a variable is undefined or omitted, we usually use typeof x === 'undefined'. However, sometimes you need to go further and differentiate these two

In this tutorial, I will introduce step by step how to setup a full-fledge email server. At the end of the tutorial, the email server will support SMTP server to

I will introduce several useful commands in Ubuntu to manipulate users and groups. Group manipulations (3 commands)List all groups: groupsAdd a new group: groupadd <new group name>

To run the AppImage package, it is effortless. Everything we need to do is making the package file executable with chmod +x <appname>.AppImage. On the other hand,

In my NVIDIA card-attached PC, the NVIDIA graphic driver always fails to start every time the Linux kernel is upgraded. Whenever I upgrade the kernel version, after a PC restart,