element.

childNodes

returns an array of an element's child nodes. element.

firstChild

returns the first child node of an element. element.

lastChild

returns the last child node of an element. element.

hasChildNodes

returns true if an element has any child nodes, otherwise false. element.

nextSibling

returns the next node at the same tree level. element.

previousSibling

returns the previous node at the same tree level. element.

parentNode

returns the parent node of an element.

Updates

paramVal

field if the row exists, otherwise inserts as a new row

INSERT INTO sysData (paramName, paramVal) 
VALUES ('payprocess', 1) 

ON DUPLICATE KEY 

UPDATE paramVal = 1 WHERE paramName = 'payprocess';

$argv

contains filename and parameters, when the

php script

is called through command line (cmd).

test_args.php

file content:

<?php

echo 'Filename:'.$argv[0].";  ";
echo 'First parameter:'.$argv[1].";  ";
echo 'Second parameter:'.$argv[2].";  ";

If we run the command:

php test_args.php first-param second-param

in

cmd

the script above will output the following:

Filename:test_args.php;  First parameter:first-param;  Second parameter:second-param;

There are five grid breakpoints to make the grid responsive: Extra small -

xs

Small -

sm

Medium -

md

Large -

lg

Extra large -

xl

Moves

sql.zip

file to the location

/var/www/

of

use.ge

server using

root

user

scp sql.zip root@use.ge:/var/www/

We can use full path for the file that we want to move

scp /var/www/sql.zip root@use.ge:/var/www/

We can also use an IP address (instead of domain name) to specify the server that we want the file to move to

scp /var/www/sql.zip root@167.172.187.21:/var/www/

After the command execution the user is required to enter password of

root

user

Installs package

npm install  /  npm i

Shows current version of

npm

npm --version  / npm -v

Creates

package.json

file with default values

npm init --yes  /  npm init -y

Installs package

moment

npm install moment --save  /  npm i moment -S

Installs package

lodash

for

dev environment

npm install lodash --save-dev  /  npm i moment -D

Installs package

live-server

globally so that other apps can use it

npm install --global live-server  /  npm i -g live-server

Other shortcuts - https://docs.npmjs.com/misc/config

xs

Extra small

<576px

sm

Small

≥576px

md

Medium

≥768px

lg

Large

≥992px

xl

Extra large

≥1200px

REPLACE INTO

is the similar to

INSERT INTO

statement. The difference is that it updates the record if it already exists. It's required one of the listed columns to be a private key of the table

REPLACE INTO students (id, first_name, points)
VALUES (41, 'ილიკო', 147)

Note 1

: If primary key is not listed, it will insert the record, but if the primary key is one of the listed columns, it will update the specified row that matches the primary key.

Note 2

: If the primary key exists, all the other omitted columns will get the default values after updating the record. Similar to the

REPLACE INTO

statement is

ON DUPLICATE KEY

. The only difference is that on duplicate key it updates only the listed columns but omitted values stays the same

INSERT INTO students (id, first_name, points) 
VALUES (41, 'გიორგი', 149) 

ON DUPLICATE KEY 

UPDATE first_name = 'გიორგი', points = 123

Deletes all packages from

node_modules

that are extraneous packages (that are not listed in

package.json

)

npm prune

Before running the above command,

npm list --depth 0

showed several packages as extraneous. Extraneous are packages that are not listed in

dependencies

or

devDependencies

but installed in

node_modules

)

+-- gulp@4.0.2 extraneous
+-- gulp-sass@4.1.0 extraneous
`-- moment@2.27.0

Pass parameter to view using

with

method

public function about() {
        $param1 = 'this is a parameter of about us page';
        return view('pages/about')->with('title', $param1);
}

Content of the blade template

@extends('layouts.app')

@section('cntnt')
    <h3>abt us {{$title}}</h3>
@endsection