it works

Sweet!

Thx

bearing in mind that there are no integers in JS

it’s all floats down here

I thought JS had an understanding of Integers, i.e. parseInt()

*confused*

nah, only 64-bit floats

It “pretends” they’re ints, but all you’re really getting are floats with zeros to the right of the decimal point.

sensible choices

😂 😭

=> (def js-two (js/parseInt "2"))
#'cljs.user/js-two
=> js-two
2
=> (def js-three (js/parseInt "3"))
#'cljs.user/js-three
=> js-three
3
=> (/ js-three js-two)
1.5
=> 

CLJS ^^

Compare to Clojure (jvm-based) —

(def clj-2 (int (Integer. "2")))
=> #'user/clj-2
clj-2
=> 2
(def clj-3 (int (Integer. "3")))
=> #'user/clj-3
clj-3
=> 3
(/ clj-3 clj-2)
=> 3/2

So I guess the JavaScript bit-wise logical operators like and, or, xor, shift, etc. coerce 64-bit floats to integers?

Or actually, I don't even know if JavaScript has such operators, but ClojureScript has functions for them like Clojure does, and they appear as if they work on the 2's complement integer representations.

yes, https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators#Signed_32-bit_integers

And for example BuckleScript uses that trick to compile to Integers https://reasonml.github.io/en/try.html?rrjsx=true&reason=C4TwDgpgBMBOHQLxQDIQIYDMoB8oDkB7AEwgAoBLAO2ABoZ4J64EBKAbgChOAbCYKPADGUAM4BXALZRklYBEmsZAPigBvTlDEB3CsCEALKHIVKNWvGiwqoABk24CJcgDd0PcUyh9MdQRQBzA2AlRFU3D2gAajEpMh8QqBiJSTJYQOCOBwBfTmyuXn4oSRAAFUYZByJSMgctAEZaOqcagCZ6avIAFnorTF6MTFYO5zIANgGsSaHh5s6yAGYRmoBWaenhlvIAdnXUQdZWByzOFLIS8rZcVQApUQA6HkIA9iA

Just like emscripten

Does JavaScript have arbitrary precision integers built in, or added on via the Google Closure library?

No - to the first question. About Closure - I don’t know

Google Closure provides Int and Long classes, but these are not performant for sure https://google.github.io/closure-library/api/goog.math.Integer.html https://google.github.io/closure-library/api/goog.math.Long.html

V8 and Chrome recently added support for BigInt btw, you can try it now in Chrome dev/beta/canary typeof 1n // "bigint"