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Modules
- Basics of Programming
- Problem Solving
- Git
- HTML
- CSS
- Sass
- JavaScript
- PHP
- Laravel
Meetings
Challenges
Projects
Tutorials
Channels
Notes
Resources

Results: 1578

Notes

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Oldest first(All)

javascript compare typeof and instanceof performance speed in huge itarations

let TIMES = 1000 * 1000 * 100

console.time("(() => { }) instanceof Function")
for (let i = 0; i < TIMES; i++)
  (() => { }) instanceof Function
console.timeEnd("(() => { }) instanceof Function")

console.time("(async () => { }) instanceof Function")
for (let i = 0; i < TIMES; i++)
  (async () => { }) instanceof Function
console.timeEnd("(async () => { }) instanceof Function")

console.time("(function () { }) instanceof Function")
for (let i = 0; i < TIMES; i++)
  (function () { }) instanceof Function
console.timeEnd("(function () { }) instanceof Function")

console.time("(async function () { }) instanceof Function")
for (let i = 0; i < TIMES; i++)
  (async function () { }) instanceof Function
console.timeEnd("(async function () { }) instanceof Function")

console.time("typeof (() => { }) === 'function'")
for (let i = 0; i < TIMES; i++)
  typeof (() => { }) === 'function'
console.timeEnd("typeof (() => { }) === 'function'")

console.time("typeof (async () => { }) === 'function'")
for (let i = 0; i < TIMES; i++)
  typeof (async () => { }) === 'function'
console.timeEnd("typeof (async () => { }) === 'function'")

console.time("typeof (function () { }) === 'function'")
for (let i = 0; i < TIMES; i++)
  typeof (function () { }) === 'function'
console.timeEnd("typeof (function () { }) === 'function'")

console.time("typeof (async function () { }) === 'function'")
for (let i = 0; i < TIMES; i++)
  typeof (async function () { }) === 'function'
console.timeEnd("typeof (async function () { }) === 'function'")

gives result

(() => { }) instanceof Function: 5490ms
(async () => { }) instanceof Function: 6884ms
(function () { }) instanceof Function: 5408ms
(async function () { }) instanceof Function: 6938ms
typeof (() => { }) === 'function': 1916ms
typeof (async () => { }) === 'function': 1998ms
typeof (function () { }) === 'function': 1976ms
typeof (async function () { }) === 'function': 1972ms

by გიორგი უზნაძე

JavaScript

Performance

call file_get_content() function with headers

First we create an array with the headers

$opts = [
	"http" => [
		"method" => "GET",
		"header" => 
			"Channel-Name: ".CHANNEL."\r\n" .
			"Authorization: ".AUTHORIZATION."\r\n"
	]
];
// Then we create a stream
$context = stream_context_create($opts);

Then we pass the

$content

file_get_contents()

function as the

third

parameter

$result = file_get_contents($url, false, $context);

by Valeri Tandilashvili

PHP

functions

List cronjobs "crontab -l"

To list all cronjobs we simply run

crontab -l

command Cronjobs will be displayed without edit mode

by Valeri Tandilashvili

Linux

Cronjobs

Edit cronjobs "crontab -e"

First we open crontab to make changes to jobs by entering

crontab -e

command Then we activate edit mode by clicking

letter After editing we need to exit from edit mode by clicking

Esc

button Then we click

:wq

to save the changes

00 21 * * * php /var/www/html/services_cron/job_payments/index.php >> /var/log/job_payments.log 2>&1

By adding the line above, we tell

cronjob

to run the following file every day at

21:00

/var/www/html/services_cron/job_payments/index.php

And write output to the log file

/var/log/job_payments.log

by Valeri Tandilashvili

Linux

Cronjobs

new self VS new static in PHP OOP

class A {
    public static function get_self() {
        return new self();
    }

    public static function get_static() {
        return new static();
    }
}

class B extends A {}

echo get_class(B::get_self());  // A
echo get_class(B::get_static()); // B
echo get_class(A::get_self()); // A
echo get_class(A::get_static()); // A

by გიორგი უზნაძე

PHP

OOP

Pass clean json data to javascript from php expecting quotes and weird characters

var controls_string = '{!!json_encode($controls, JSON_HEX_APOS) ?? ""!!}';
controls_string = controls_string.replace(/[\u0000-\u0019]+/g,"");
var controls = JSON.parse(controls_string);

or shorter version

var controls = JSON.parse('{!!json_encode($controls, JSON_HEX_APOS) ?? ""!!}'.replace(/[\u0000-\u0019]+/g,""));

by გიორგი უზნაძე

script tags with defer attrribute

This Boolean attribute is set to indicate to a browser that the script is meant to be executed after the document has been parsed, but before firing DOMContentLoaded. Scripts with the defer attribute will prevent the DOMContentLoaded event from firing until the script has loaded and finished evaluating This attribute must not be used if the src attribute is absent (i.e. for inline scripts), in this case it would have no effect.

by გიორგი უზნაძე

JavaScript

DOM

script ELEMENT

Detect tab focus and blur on all browsers and run callbacks

var hidden, visibilityState, visibilityChange;
        
            if (typeof document.hidden !== "undefined") {
                hidden = "hidden", visibilityChange = "visibilitychange", visibilityState = "visibilityState";
            }
            else if (typeof document.mozHidden !== "undefined") {
                hidden = "mozHidden", visibilityChange = "mozvisibilitychange", visibilityState = "mozVisibilityState";
            }
            else if (typeof document.msHidden !== "undefined") {
                hidden = "msHidden", visibilityChange = "msvisibilitychange", visibilityState = "msVisibilityState";
            }
            else if (typeof document.webkitHidden !== "undefined") {
                hidden = "webkitHidden", visibilityChange = "webkitvisibilitychange", visibilityState = "webkitVisibilityState";
            }
        
            document.addEventListener(visibilityChange, function(event){
                switch (document[visibilityState]) {
                    case "visible":
                        // tab is focused
                        break;
                    case "hidden":
                        // tab is blurred 
                        break;
                }
            });

by გიორგი უზნაძე

Javascript shallow clone with same prototype and property descriptors

old way

function shallowClone(obj) {
    var clone = Object.create(Object.getPrototypeOf(obj));

    var props = Object.getOwnPropertyNames(obj);
    props.forEach(function(key) {
        var desc = Object.getOwnPropertyDescriptor(obj, key);
        Object.defineProperty(clone, key, desc);
    });

    return clone;
}

In ES2017

function shallowClone(obj) {
    return Object.create(
        Object.getPrototypeOf(obj), 
        Object.getOwnPropertyDescriptors(obj) 
    );
}

by გიორგი უზნაძე

JavaScript

Object

Fake User-Agent header if website blocks scripts from accessing content

$context = stream_context_create(
    array(
        "http" => array(
            "header" => "User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36"
        )
    )
);

echo file_get_contents("www.google.com", false, $context);

by გიორგი უზნაძე

PHP

Results: 1578