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Valeri Tandilashvili's Personal Professional Blog
Results: 1024
ctype_alnum
function 
ctype_alnum
returns true if the value contains only alphanumeric letters. In the example 
IF
statement will be executed because the value is alphanumeric
$var = 'as2df234asdf';

if (ctype_alnum($var)) {
	echo 'if';
} else {
	echo 'else';
}
FS module readdir CODE
Reads the current directory synchronously
const fs = require('fs')

// With Sync function
let files = fs.readdirSync('./')
console.log(files)
Reads the current directory asynchronously
const fs = require('fs')

// With Async function
fs.readdir('./', function(err, files){
    if (err) {
        console.log('Error', err)
    } else {
        console.log(files)
    }
})
OS module CODE
Prints total and free memory using OS built-in module:
const os = require('os')

let totalMemory = os.totalmem()
let freeMemory = os.freemem()

console.log(`Total memory: ${totalMemory}`)
console.log(`Free memory: ${freeMemory}`)
Export object CODE 
logger.js
file exports object which contains only the 
log()
function. Content of the 
logger.js
file:
function log(message) {
  console.log(message)
}

module.exports.log = log
The 
log()
function is called in the 
index.js
file:
const logger = require('./logger')

logger.log('some text')
Export function CODE 
logger.js
file exports 
log()
function. Content of the 
logger.js
file:
function log(message) {
  console.log(message)
}

module.exports = log
The 
log()
function is called in the 
index.js
file:
const log = require('./logger')

log('some text')
module CODE
Each 
.js
file is a 
module
itself, which contains important information about the file. If we 
console.log(module)
, it will print the following object:
Module {
  id: '.',
  path: '/home/runner/xrfnkv6ixs',
  exports: {},
  parent: null,
  filename: '/home/runner/xrfnkv6ixs/index.js',
  loaded: false,
  children: [],
  paths: [
    '/home/runner/xrfnkv6ixs/node_modules',
    '/home/runner/node_modules',
    '/home/node_modules',
    '/node_modules'
  ],
  _compile: [Function]
}
exports
key includes the content (variable / function / object) that's going to be publicly available for other modules 
filename
key is equal to the module file location ...
outline VS border CODE
As default 
border
size is included into container's width but 
outline
property is opposite of border, it's added outside of the container
object-fit: cover VS contain CODE 
contain
will show the entire image
#img1 {
  object-fit: contain;
}
cover
will take the entire space and maintain the image aspect ratio
#img2 {
  object-fit: cover;
}
inset CODE
The 
inset
property in CSS is a shorthand for the following four properties: 
top
, 
right
, 
bottom
and 
left
.exampleText {
  position: absolute;
  inset: 10px 30px 60px 40px;
  background-color: yellow;
}
Its parent element needs to have 
position
property with 
relative
value
div {
  background-color: green;
  height: 200px;
  position: relative;
  color: blue;
}
querySelector VS querySelectorAll
Affects only the first element with the specified class 
.slide
document.querySelector('.slide').remove()
Removes all the elements with the specified class
document.querySelectorAll('.slide').remove()
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