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1.Optional Chaining (?.):

Optional chaining allows you to safely access nested properties or methods without worrying about null or undefined values. It short-circuits the evaluation if any intermediate property is null or undefined.

const user = {
  name: 'John',
  address: {
    city: 'New York',
    postalCode: '12345'
  }

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/* Background styles */
body {
    background-image: url('https://images.unsplash.com/photo-1519681393784-d120267933ba?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=1124&q=100');
    background-position: center;
}

/* Glassmorphism card effect */
.card {
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);

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select current_database() as database,
       pg_size_pretty(total_database_size) as total_database_size,
       schema_name,
       table_name,
       pg_size_pretty(total_table_size) as total_table_size,
       pg_size_pretty(table_size) as table_size,
       pg_size_pretty(index_size) as index_size
       from ( select table_name,
                table_schema as schema_name,
                pg_database_size(current_database()) as total_database_size,

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// /*
// Unival Tree


// #1: 5
//  0
// |  \
// 0   1   
// | \

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#r "nuget: Elmish, 3.1.0"
#r "nuget: Terminal.Gui.Elmish, 0.1.8-preview1"

open System
open Elmish

type Model = { Count: int }

type Messages =
    | Incr

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docker run -it \
--device /dev/kvm \
-p 50922:10022 \
-e "DISPLAY=${DISPLAY:-:0}" \
-v /mnt/wslg/.X11-unix:/tmp/.X11-unix \
-e GENERATE_UNIQUE=true \
-e AUDIO_DRIVER=pa,server=unix:/tmp/pulseaudio.socket \
-v "/run/user/$(id -u)/pulse/native:/tmp/pulseaudio.socket" \
-e RAM=8 \
-v "/mnt/c:/mnt/c" \

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Gist markdown examples

A collection of Markdown code and tricks that were tested to work in Gist.

This and all public gists in https://gist.github.com/ww9 are Public Domain. Do whatever you want with it including , no need to credit me.

Todo

• Reformat this whole document and assimilate these:

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module ProtbufConnection2 =
    let readWriteTimeout = 120000


    let writeMessage (clientSocket: ClientWebSocket) (token: Threading.CancellationToken) (req: #IMessage<Request>) =
        let sendBuf = Array.zeroCreate (1024 * 1024)

        use co =
            new Google.Protobuf.CodedOutputStream(sendBuf)

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module TodoBasic

open System
open System.Text.Json.Serialization
open System.Threading.Tasks
open Microsoft.AspNetCore.Builder
open Microsoft.AspNetCore.Http
open Microsoft.AspNetCore.Routing
open Microsoft.AspNetCore.Hosting
open Microsoft.Extensions.Hosting

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{
  "final_space": true,
  "osc99": false,
  "console_title": false,
  "console_title_style": "",
  "console_title_template": "",
  "blocks": [
    {
      "type": "prompt",
      "alignment": "left",