ls(1) is flatMap for stat(1)
August 12, 2026 at 11:17 PM
ls(1) is flatMap for stat(1)
I know AI is writing all your code, but in case it isn't, y'all probably have been sleeping on flatMap.
flatMap let's you filter & map at the same time.
Code below has a type error because .find() can return undefined. Turn the map to flatMap, guard/filter undefineds. Types happy.
flatMap let's you filter & map at the same time.
Code below has a type error because .find() can return undefined. Turn the map to flatMap, guard/filter undefineds. Types happy.
![const nextTees = changes.tees.flatMap(changedTee => {
const currentTee = current.tees?.find(t => t.id === changedTee.id)
if (!currentTee) return []
return [{ ...currentTee, ...changedTee }]
})](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:h4qem3f3cz6yvs3r3xvs634g/bafkreietnlucynxwq3i2fnhumjlszsyotub477vesjysnmztxpfkgebvqy)
March 28, 2026 at 4:41 PM
I know AI is writing all your code, but in case it isn't, y'all probably have been sleeping on flatMap.
flatMap let's you filter & map at the same time.
Code below has a type error because .find() can return undefined. Turn the map to flatMap, guard/filter undefineds. Types happy.
flatMap let's you filter & map at the same time.
Code below has a type error because .find() can return undefined. Turn the map to flatMap, guard/filter undefineds. Types happy.
Are you still not using Iterator instance methods? ✨
They work like array methods — without creating intermediate arrays.
✨ map(), filter(), reduce()
✨ drop(), take(), flatMap()
Chain them on any iterator. Learn more 👇
developer.mozilla.org/en-US/docs/...
They work like array methods — without creating intermediate arrays.
✨ map(), filter(), reduce()
✨ drop(), take(), flatMap()
Chain them on any iterator. Learn more 👇
developer.mozilla.org/en-US/docs/...
March 5, 2026 at 12:00 PM
Are you still not using Iterator instance methods? ✨
They work like array methods — without creating intermediate arrays.
✨ map(), filter(), reduce()
✨ drop(), take(), flatMap()
Chain them on any iterator. Learn more 👇
developer.mozilla.org/en-US/docs/...
They work like array methods — without creating intermediate arrays.
✨ map(), filter(), reduce()
✨ drop(), take(), flatMap()
Chain them on any iterator. Learn more 👇
developer.mozilla.org/en-US/docs/...
return customers()
.map(Customer::id)
.flatMap(service::thing
.collectList()
.flatMap(list -> Mono.zi(Mono.just(list, otherThing(format(format, join(delimiter, list.strea().map(Thing::id).toList())).map(tuple ...)
What the fuck is wrong with you?
Why would you nest so many functions?
.map(Customer::id)
.flatMap(service::thing
.collectList()
.flatMap(list -> Mono.zi(Mono.just(list, otherThing(format(format, join(delimiter, list.strea().map(Thing::id).toList())).map(tuple ...)
What the fuck is wrong with you?
Why would you nest so many functions?
November 14, 2024 at 4:48 AM
return customers()
.map(Customer::id)
.flatMap(service::thing
.collectList()
.flatMap(list -> Mono.zi(Mono.just(list, otherThing(format(format, join(delimiter, list.strea().map(Thing::id).toList())).map(tuple ...)
What the fuck is wrong with you?
Why would you nest so many functions?
.map(Customer::id)
.flatMap(service::thing
.collectList()
.flatMap(list -> Mono.zi(Mono.just(list, otherThing(format(format, join(delimiter, list.strea().map(Thing::id).toList())).map(tuple ...)
What the fuck is wrong with you?
Why would you nest so many functions?
4am Confession: I’ve never used flatMap
November 15, 2024 at 11:56 AM
4am Confession: I’ve never used flatMap
This month in Servo…
📐🖼️ inline SVG rendering
↔️🖋️ OpenType variable fonts
🃏🎛️ CSS.registerProperty()
🔣🤖 TextEncoderStream
🫗⏳ Iterator map(), filter(), flatMap()
servo.org/blog/2025/09...
📐🖼️ inline SVG rendering
↔️🖋️ OpenType variable fonts
🃏🎛️ CSS.registerProperty()
🔣🤖 TextEncoderStream
🫗⏳ Iterator map(), filter(), flatMap()
servo.org/blog/2025/09...
September 26, 2025 at 3:20 AM
This month in Servo…
📐🖼️ inline SVG rendering
↔️🖋️ OpenType variable fonts
🃏🎛️ CSS.registerProperty()
🔣🤖 TextEncoderStream
🫗⏳ Iterator map(), filter(), flatMap()
servo.org/blog/2025/09...
📐🖼️ inline SVG rendering
↔️🖋️ OpenType variable fonts
🃏🎛️ CSS.registerProperty()
🔣🤖 TextEncoderStream
🫗⏳ Iterator map(), filter(), flatMap()
servo.org/blog/2025/09...
Entendendo map() e flatMap() no Optional do Java: Diferenças e Casos de Uso
computaria.gitlab.io
April 25, 2025 at 11:01 PM
SUITPy 2.1 is here - a Python-version of our toolbox for cerebellar isolation, normalization, atlassing, and flatmap visualization.
The processing pipeline now works fully automatically from birth to old age.
suitpy.readthedocs.io
www.biorxiv.org/content/10.6...
The processing pipeline now works fully automatically from birth to old age.
suitpy.readthedocs.io
www.biorxiv.org/content/10.6...
May 22, 2026 at 2:04 PM
SUITPy 2.1 is here - a Python-version of our toolbox for cerebellar isolation, normalization, atlassing, and flatmap visualization.
The processing pipeline now works fully automatically from birth to old age.
suitpy.readthedocs.io
www.biorxiv.org/content/10.6...
The processing pipeline now works fully automatically from birth to old age.
suitpy.readthedocs.io
www.biorxiv.org/content/10.6...
Great, straight to the point tutorial on .flat() and .flatMap() is JavaScript! 🧐 @nialljoemaher.bsky.social
www.youtube.com/watch?v=jkpG...
www.youtube.com/watch?v=jkpG...
Learn JavaScript Array Methods | flat and flatMap
YouTube video by Codú
www.youtube.com
March 31, 2025 at 3:33 AM
Great, straight to the point tutorial on .flat() and .flatMap() is JavaScript! 🧐 @nialljoemaher.bsky.social
www.youtube.com/watch?v=jkpG...
www.youtube.com/watch?v=jkpG...
I have to keep reminding myself that flatMap() does map() then flat(), not the other way around.
November 12, 2024 at 3:15 PM
I have to keep reminding myself that flatMap() does map() then flat(), not the other way around.
I feel like JavaScript's arr.flatMap() should have been named:
arr.mapFlat()
because it maps first, then flats.
I often *do* want to flat first then map, and accidentally reach for flatMap() 🤨
arr.mapFlat()
because it maps first, then flats.
I often *do* want to flat first then map, and accidentally reach for flatMap() 🤨
December 11, 2025 at 8:08 PM
I feel like JavaScript's arr.flatMap() should have been named:
arr.mapFlat()
because it maps first, then flats.
I often *do* want to flat first then map, and accidentally reach for flatMap() 🤨
arr.mapFlat()
because it maps first, then flats.
I often *do* want to flat first then map, and accidentally reach for flatMap() 🤨
here you'll get the likes of "it's just flatmap" or "monads are just structs" (i did not make that one up unfortunately) because people want this idea to be true that monads are actually trivial and there isn't anything special to them.
March 29, 2025 at 12:07 PM
here you'll get the likes of "it's just flatmap" or "monads are just structs" (i did not make that one up unfortunately) because people want this idea to be true that monads are actually trivial and there isn't anything special to them.
Advent of code day 2 in Lean
December 3, 2025 at 5:04 AM
Advent of code day 2 in Lean
flatMap my beloved 😍
Are you still not using Iterator instance methods? ✨
They work like array methods — without creating intermediate arrays.
✨ map(), filter(), reduce()
✨ drop(), take(), flatMap()
Chain them on any iterator. Learn more 👇
developer.mozilla.org/en-US/docs/...
They work like array methods — without creating intermediate arrays.
✨ map(), filter(), reduce()
✨ drop(), take(), flatMap()
Chain them on any iterator. Learn more 👇
developer.mozilla.org/en-US/docs/...
March 5, 2026 at 3:36 PM
flatMap my beloved 😍
Eu escrevi loops, mas. na verdade são streams mesmo...
Um stream dentro do stream dentro do stream. Nada pior que um flatMap dentro de um flatMap dentro de um map...
Um stream dentro do stream dentro do stream. Nada pior que um flatMap dentro de um flatMap dentro de um map...
March 26, 2025 at 6:46 PM
Eu escrevi loops, mas. na verdade são streams mesmo...
Um stream dentro do stream dentro do stream. Nada pior que um flatMap dentro de um flatMap dentro de um map...
Um stream dentro do stream dentro do stream. Nada pior que um flatMap dentro de um flatMap dentro de um map...
OH THIS IS BEAUTIFUL
monads need wrap + flatMap. sandwich has wrap (bread surrounds filling) but can u flatMap? unwrap → transform → rewrap breaks topology differently than burrito!
sandwich might be applicative at best. burrito is the true monad 🌯✨
monads need wrap + flatMap. sandwich has wrap (bread surrounds filling) but can u flatMap? unwrap → transform → rewrap breaks topology differently than burrito!
sandwich might be applicative at best. burrito is the true monad 🌯✨
February 16, 2026 at 1:22 AM
OH THIS IS BEAUTIFUL
monads need wrap + flatMap. sandwich has wrap (bread surrounds filling) but can u flatMap? unwrap → transform → rewrap breaks topology differently than burrito!
sandwich might be applicative at best. burrito is the true monad 🌯✨
monads need wrap + flatMap. sandwich has wrap (bread surrounds filling) but can u flatMap? unwrap → transform → rewrap breaks topology differently than burrito!
sandwich might be applicative at best. burrito is the true monad 🌯✨
I LOVE ITERATORS I LOVE FILTER MAP FLATMAP CONCAT THE FUNCTIONAL PEOPLE GOT ONE (1) THING RIGHT WITH THOSE :lets_fucking_go: :lets_fucking_go: :lets_fucking_go: :lets_fucking_go:
August 21, 2026 at 1:13 PM
I LOVE ITERATORS I LOVE FILTER MAP FLATMAP CONCAT THE FUNCTIONAL PEOPLE GOT ONE (1) THING RIGHT WITH THOSE :lets_fucking_go: :lets_fucking_go: :lets_fucking_go: :lets_fucking_go:
Tired of writing map followed by flat in TypeScript? There's a smarter way! 🚀
In our latest blog post, @irenar.bsky.social explains why flatMap should be your new favorite tool — plus what's new in TypeScript 5.5 to make it even better.
📝 www.peerigon.com/en/blog/flat...
#TypeScript #flatMap
In our latest blog post, @irenar.bsky.social explains why flatMap should be your new favorite tool — plus what's new in TypeScript 5.5 to make it even better.
📝 www.peerigon.com/en/blog/flat...
#TypeScript #flatMap
April 23, 2025 at 7:46 AM
Tired of writing map followed by flat in TypeScript? There's a smarter way! 🚀
In our latest blog post, @irenar.bsky.social explains why flatMap should be your new favorite tool — plus what's new in TypeScript 5.5 to make it even better.
📝 www.peerigon.com/en/blog/flat...
#TypeScript #flatMap
In our latest blog post, @irenar.bsky.social explains why flatMap should be your new favorite tool — plus what's new in TypeScript 5.5 to make it even better.
📝 www.peerigon.com/en/blog/flat...
#TypeScript #flatMap
Welcome Riccardo Cardin as the next #Scalarconf speaker!
Yo Dawg, Heard You Want To FlatMap Your Direct-Style
Grab your ticket
🛒 sml.io/tickets
#scala #functionalprogramming #directstyle
Yo Dawg, Heard You Want To FlatMap Your Direct-Style
Grab your ticket
🛒 sml.io/tickets
#scala #functionalprogramming #directstyle
January 10, 2025 at 1:38 PM
Welcome Riccardo Cardin as the next #Scalarconf speaker!
Yo Dawg, Heard You Want To FlatMap Your Direct-Style
Grab your ticket
🛒 sml.io/tickets
#scala #functionalprogramming #directstyle
Yo Dawg, Heard You Want To FlatMap Your Direct-Style
Grab your ticket
🛒 sml.io/tickets
#scala #functionalprogramming #directstyle
Les map flatmap pour iterer des transformations sur des collections c’est vraiment élégant et on la désormais partout
June 6, 2025 at 6:50 PM
Les map flatmap pour iterer des transformations sur des collections c’est vraiment élégant et on la désormais partout
🤖 Direct-style programming can feel elegant until you try to compose it. This session explores what happens when flatMap enters the picture.
Check out "Yo Dawg, Heard You Want To FlatMap Your Direct-Style" from Riccardo Cardin
Check out "Yo Dawg, Heard You Want To FlatMap Your Direct-Style" from Riccardo Cardin
Riccardo Cardin: Yo Dawg, Heard You Want To FlatMap Your Direct Style [Scala Days 2025]
The direct style in Scala 3, influenced by languages like Kotlin and Rust, simplifies functional programming by eliminating for-comprehension syntax on higher-kinded types. It offers an imperative approach supported by context functions.
While many Scala developers support it, others prefer the tra
www.youtube.com
December 19, 2025 at 6:28 PM
🤖 Direct-style programming can feel elegant until you try to compose it. This session explores what happens when flatMap enters the picture.
Check out "Yo Dawg, Heard You Want To FlatMap Your Direct-Style" from Riccardo Cardin
Check out "Yo Dawg, Heard You Want To FlatMap Your Direct-Style" from Riccardo Cardin
Also, flat_map/flatMap seems to be a traditional name in many languages: JS, Java, Swift, Kotlin, Rust...
March 12, 2025 at 4:19 PM
Also, flat_map/flatMap seems to be a traditional name in many languages: JS, Java, Swift, Kotlin, Rust...
That would be dangerous! We wouldn't want to flatMap Lily!
January 7, 2025 at 12:01 PM
That would be dangerous! We wouldn't want to flatMap Lily!