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'
}
| /* 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%); |
| 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, |
| // /* | |
| // Unival Tree | |
| // #1: 5 | |
| // 0 | |
| // | \ | |
| // 0 1 | |
| // | \ |
| #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 |
| 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" \ |
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.
| 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) |
| 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 |
| { | |
| "final_space": true, | |
| "osc99": false, | |
| "console_title": false, | |
| "console_title_style": "", | |
| "console_title_template": "", | |
| "blocks": [ | |
| { | |
| "type": "prompt", | |
| "alignment": "left", |