4 ms·

> Thinking || allows for set operations: states.includes('VALID' || 'IN_PROGRESS') Genuinely wondering what language that would have been valid in.

malfist 3y ago
English. Have a brain fart one day and you'll write something like this and be confused why it doesn't work
swatcoder 3y ago
The type system in TypeScript can compose types from string literals using a similar syntax. Obviously, this is runtime code, not a type declaration, but you can see how a new or tired/busy developer’s brain might spit this out in the wrong place.
recursive 3y ago
You can do this in C#, which is similar if you squint. states.Any(s => s is "VALID" or "IN_PROGRESS") I'm sure there are languages where a match-able pattern is an expression, allowing the original code basically unchanged.
- simlevesque 3y ago
  You can do it in JS too: states.find(state => state === 'VALID' || state === 'IN_PROGRESS') Or states.find(state => ['VALID', 'IN_PROGRESS'].includes(state))
  - recursive 3y ago
    This is a little further away IMO, as it doesn't have the `v1 or v2` construction.
dragonwriter 3y ago
> Genuinely wondering what language that would have been valid in. Raku, but using “junctive or” | (which creates an any junction of its arguments, which “autothreads” on method calls producing a Junction of the results) instead of “tight or” ||.
nodoodles 3y ago
One could abuse Kotlin to make almost this syntax valid. Something like: states.includes { +”VALID” || +”IN_PROGRESS” } Where statestype function ‘includes’ takes a lambda that’s run in states context and overrides plus operator for string to evaluate to states.contains(that string). One could, but should they?
SonOfLilit 3y ago
I was amazed to discover COBOL has something like this: IF X = 0 OR = 1 OR = 2
barosl 3y ago
> states.intersection({'VALID'} | {'IN_PROGRESS'}) Does this Python code count? Haha.
- masklinn 3y ago
  No, that’s the explicit conjunction of two explicit sets. ‘VALID’ or ‘IN_PROGRESS’ in states Does not work and I’ve seen it around or SO. Or more commonly it’s variation a == b or c
lizmat 3y ago
Almost in the Raku Programming Language, bit with a single | states.includes('VALID' | 'IN_PROGRESS') is effectively the same as: states.includes('VALID') || states.includes('IN_PROGRESS') See https://docs.raku.org/type/Junction https://docs.raku.org/type/Junction
baq 3y ago
datadog allows exactly this syntax modulo JS: attribute:(value OR another_value)
deleted 3y ago
[deleted]

malfist 3y ago

English. Have a brain fart one day and you'll write something like this and be confused why it doesn't work

swatcoder 3y ago

The type system in TypeScript can compose types from string literals using a similar syntax. Obviously, this is runtime code, not a type declaration, but you can see how a new or tired/busy developer’s brain might spit this out in the wrong place.

recursive 3y ago

You can do this in C#, which is similar if you squint. states.Any(s => s is "VALID" or "IN_PROGRESS") I'm sure there are languages where a match-able pattern is an expression, allowing the original code basically unchanged.

simlevesque 3y ago
You can do it in JS too: states.find(state => state === 'VALID' || state === 'IN_PROGRESS') Or states.find(state => ['VALID', 'IN_PROGRESS'].includes(state))
- recursive 3y ago
  This is a little further away IMO, as it doesn't have the `v1 or v2` construction.

dragonwriter 3y ago

> Genuinely wondering what language that would have been valid in. Raku, but using “junctive or” | (which creates an any junction of its arguments, which “autothreads” on method calls producing a Junction of the results) instead of “tight or” ||.

nodoodles 3y ago

One could abuse Kotlin to make almost this syntax valid. Something like: states.includes { +”VALID” || +”IN_PROGRESS” } Where statestype function ‘includes’ takes a lambda that’s run in states context and overrides plus operator for string to evaluate to states.contains(that string). One could, but should they?

SonOfLilit 3y ago

I was amazed to discover COBOL has something like this: IF X = 0 OR = 1 OR = 2

barosl 3y ago

> states.intersection({'VALID'} | {'IN_PROGRESS'}) Does this Python code count? Haha.

masklinn 3y ago
No, that’s the explicit conjunction of two explicit sets. ‘VALID’ or ‘IN_PROGRESS’ in states Does not work and I’ve seen it around or SO. Or more commonly it’s variation a == b or c

lizmat 3y ago

Almost in the Raku Programming Language, bit with a single | states.includes('VALID' | 'IN_PROGRESS') is effectively the same as: states.includes('VALID') || states.includes('IN_PROGRESS') See https://docs.raku.org/type/Junction https://docs.raku.org/type/Junction

baq 3y ago

datadog allows exactly this syntax modulo JS: attribute:(value OR another_value)

deleted 3y ago

[deleted]