jbr/sibilant

Javascript with a lisp

Jacob Rothstein

@jbr

https://docs.sibilant.org/has-key

Shivansh Suhane

@shivansh_suhane_twitter

Cool! I wasn't sure if anyone is here but that helps!

Jacob Rothstein

@jbr

Thanks for learning sibilant!

Shivansh Suhane

@shivansh_suhane_twitter

Thanks for the help!

Actually, if you have a moment, I'd appreciate one more thing. I'm trying to do the following:

if (cur in d){
d[cur]+=1
}
else{
d[cur]=0
}
}

But in sibilant. I'm stuck at:

(each str inputStr
(console.log str)
if (has-key? d str) (d[str]+=1) (d[str]=0)
)

@jbr

Jacob Rothstein

@jbr

(each str input-str 
  (console.log str)
  (if (has-key? d str)
    (incr (get d str))
    (set d str 0)))

i think you want something like that maybe?

or equivalently,

(each str input-str 
  (console.log str)
  (set d str (if (has-key? d str)
    (+ 1 (get d str))
    0)))

Shivansh Suhane

@shivansh_suhane_twitter

Thanks! That makes complete sense

Shivansh Suhane

@shivansh_suhane_twitter

@jbr Do we have sort or reverse in Sibilant? If not, I could try to contribute sorting! Documentation doesn't mention sort anywhere.

Jacob Rothstein

@jbr

"it's just javascript" so https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort works

(var x [ 4 1 5 2 3])
(.sort x)
(console.log x) ;; ⇒ [ 1 2 3 4 5 ]

Shivansh Suhane

@shivansh_suhane_twitter

That's super cool! I was getting weird errors trying it as the syntax was wrong 😅

Jacob Rothstein

@jbr

and for reverse: (.reverse x). to chain reversing and console.logging, check this out: (|> [ 1 2 3 4] .reverse console.log) which is the same as console.log([ 1, 2, 3, 4 ].reverse())

you can also just do (x.sort) or (x.reverse) instead of (.sort x) or (.reverse x), they both work

Shivansh Suhane

@shivansh_suhane_twitter

Ah interesting, I was doing something like:

(var result Object.entries(d))
(.sort result)
(.reverse result)
(console.log result)

but the chain linking is super cool

Could we sort by the second value in a 2-d array?

Jacob Rothstein

@jbr

yeah, that would be an argument to the Array.prototype.sort function

Shivansh Suhane

@shivansh_suhane_twitter

Think I understand the JS version:

function comparator(a, b) {
if (a[1] > b[1]) return -1
if (a[1] < b[1]) return 1
return 0
}

myArray = myArray.sort(comparator)

Jacob Rothstein

@jbr

so sorting by the second element in sibilant might look like:

(var x [[0 1] [ 3 5] [ 0 0 ]])
(.sort x (#([a b] [c d])
  (if (< b d) -1
      (= b d) 0
      1)))
(console.log x)

(if i got the logic right)

Shivansh Suhane

@shivansh_suhane_twitter

That worked like a charm. Thanks!

Jacob Rothstein

@jbr

:tada:

Shivansh Suhane

@shivansh_suhane_twitter

🥳🥳

motivate

@motivate:matrix.org

[m]

I need your help

regarding sorting this

I want my count to be printed in descending order

but I am not able to do it in sibilant

please help

I am using this

code

from above reference

Jacob Rothstein

@jbr

could you reformat that as one code block? it's hard to tell what you're doing

I don't see anything about sorting in that code block

motivate

@motivate:matrix.org

[m]

it is giving me output for input: (var strings (list 'hello 'hi 'hi 'hello 'hi))

output: { hello: 2, hi: 3 }
undefined

@jbr

@jbr: I have not done sorting in this code

Jacob Rothstein

@jbr

could you reformat the code into a single block? i can't really tell what's going on

motivate

@motivate:matrix.org

[m]

I want my output to be {hi:3, hello:2} in descending order

okay let me send a picture to you

Jacob Rothstein

@jbr

please just use ```

motivate

@motivate:matrix.org

[m]

Nope I am not able to do it

Jacob Rothstein

@jbr

``` is different from '''

motivate

@motivate:matrix.org

[m]

ohh okay sorry

Jacob Rothstein

@jbr

there's a lot going on here. console.log returns undefined

so arrayToHash returns undefined

motivate

@motivate:matrix.org

[m]

Yes I want to remove this undefined

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