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ClojureScript deep equal for JavaScript objects


ClojureScript deep equal for JavaScript objects

By : miftah bintang
Date : October 18 2020, 01:08 AM
To fix this issue Since the "=" function can compare ClojureScript collections, one immediate solutions should be:
code :
(= (js->clj (js-obj "a" 1)) (js->clj (js-obj "a" 1))) ;; => true
(= (js->clj (js/THREE.Vector3. 10 20 30)) (js->clj (js/THREE.Vector3. 10 20 30))) ;; => false
(ns my.name-space
  (:import goog.object)
  (:require [cljsjs.three]))

(.equals goog.object (js/THREE.Vector3. 10 20 30) (js/THREE.Vector3. 10 20 30))) ;; => true


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ClojureScript Hash Map performance vs. Javascript Objects

ClojureScript Hash Map performance vs. Javascript Objects


By : Oskar Johnson Hägglu
Date : March 29 2020, 07:55 AM
help you fix your problem If it is under your control, consider producing EDN instead of JSON on the server side. I'm not sure if parsing a EDN string is faster than converting JSON to EDN, but at the very least it will reduce your app's complexity to some degree.
As per your description, it sounds like the data structure will be "read-only". Then the object construction cost is practically the only one you have to consider - reading it later will be cheap (persistent maps and vectors have near-constant access time).
What is the fastest and efficient way to check Deep Equal for two java objects?

What is the fastest and efficient way to check Deep Equal for two java objects?


By : user3495996
Date : March 29 2020, 07:55 AM
help you fix your problem Override equals() or have a *helper method (bad option!) and do it in 5 steps :
code :
1. Check for *not null*.
2. Check for same *type*.
3. Check for *size of byte[]*.
4. Check for `==` (*reference equality* of byte[]) 
5. Start comparing byte values 
How to deep map JavaScripts for (var a in b) to ClojureScript?

How to deep map JavaScripts for (var a in b) to ClojureScript?


By : Madhav Reddy
Date : March 29 2020, 07:55 AM
seems to work fine This code appears to treat an object as a set of key-value pairs:
code :
(doc js->clj)

-------------------------
cljs.core/js->clj
([x] [x & opts])
  Recursively transforms JavaScript arrays into ClojureScript
  vectors, and JavaScript objects into ClojureScript maps.  With
  option ':keywordize-keys true' will convert object fields from
  strings to keywords.
{1: {2: "a"}, 3: [true, 4]}
{"1" {"2" "a"}, "3" [true 4]}
for (a in {1: {2: "a"}, 3: {4: "b"}) { console.log(a); };
(doseq [[k v] (js->clj js/g)]
  (.log js/console k))
(clojure.walk/postwalk
  #(do (.log js/console "PostWalking" %)
       %)
  {:a 1 :b {:c 2}})

(clojure.walk/prewalk
  #(do (.log js/console "PreWalking" %)
       %)
  {:a 1 :b {:c 2}})
What is 'conceptually equal' ('is-equal' module from npm) vs '==='/'=='. JavaScript. Objects comparison.

What is 'conceptually equal' ('is-equal' module from npm) vs '==='/'=='. JavaScript. Objects comparison.


By : John
Date : March 29 2020, 07:55 AM
around this issue Strict or loose comparison operators (the === and == respectively) are both useless if you want to compare object or arrays. This module lets you compare things like arrays and objects easily.
For example this is all true:
code :
1 == 1
1 === 1
'abc' == 'abc'
'abc' === 'abc'
true == true
true === true
null == null
null === null
[1, 2, 3] == [1, 2, 3]
[1, 2, 3] === [1, 2, 3]
{a: 1, b: 2} == {a: 1, b: 2}
{a: 1, b: 2} === {a: 1, b: 2}
/.*/ == /.*/
/.*/ === /.*/
new Date('2017') == new Date('2017')
new Date('2017') === new Date('2017')
equal(1, 1)
equal('abc', 'abc')
equal(true, true)
equal(null, null)
equal([1, 2, 3], [1, 2, 3])
eqial({a: 1, b: 2}, {a: 1, b: 2})
equal(/.*/, /.*/)
equal(new Date('2017'), new Date('2017'))
Serialize JavaScript objects in ClojureScript

Serialize JavaScript objects in ClojureScript


By : user3706384
Date : March 29 2020, 07:55 AM
Hope this helps ClojureScript does not attempt to serialize JS objects with a constructor, apart from some exceptions, like js/Date. In the case of js/Error, it makes sense to first ask: how would this be solved in the JS world? One answer is available here: https://stackoverflow.com/a/26199752/564509
code :
(.stringify js/JSON (.getOwnPropertyNames js/Object err))
(defn err->edn [e]
  (into {}
        (map (fn [k]
               [(keyword k) (js->clj (gobject/get e k))]))
        (.getOwnPropertyNames js/Object e)))
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