clojurescript

问题 This post of mine discusses Thomson's paradox, and simulates it in Clojure. The state function returns the state of the lamp at time = t. (defn thomsons-lamp [] (iterate (fn [[onoff dur]] [(not onoff) (/ dur 2)]) [true 1])) (defn state [t] (let [t-vals (map second (thomsons-lamp))] (loop [i 1] (if (<= t (apply + (take i t-vals))) ((comp first last) (take i (thomsons-lamp))) (recur (inc i)))))) How do I define a cleaner state function (preferably without loop/recur)? 回答1: The only sins here

问题 I'm integrating some ClojureScript code with a JS library call that takes a callback function. The JS library passes data to the callback using JavsScript's "this" keyword. I can get it to work using (js* "this"). For example: (libraryCall (fn [] (.log console (js* "this")))) Is there a way to get at the "this" context from ClojureScript without resorting to js*? 回答1: Use the built-in this-as macro. It takes a name and a body, and evaluates the body with the name bound to JavaScript this . e

问题 I have an app in ClojureScript, which uses Google's Closure Compiler as a compiler backend. The resulting bundle using advanced optimizations seems way too big for what it is. I blame the dependencies but how do I find out which modules are taking the most bytes in the output bundle? I scanned through all the Closure Compiler options and didn't find anything useful. Then I tried to learn about source maps and use that to calculate individual module size but with no success. I would like a

问题 defstruct is not supported in ClojureScript - it would appear to be by design. Now it may be that this is effectively a deprecated part of the Clojure language, and the designers of ClojureScript were just hoping everyone had moved on. (But this is my speculation). My question is: What was the reasoning behind ClojureScript not needing Clojure's defstruct? 回答1: defstruct is effectively deprecated in the language, in favor of defrecord . We are supposed to move on in (JVM-based) Clojure, so I

问题 I'm trying to understand the namespacing model in clojurescript. I understand that javascript doesn't come built in with namespace support, so its been an add on via the google closure library. However, I don't understand how clojurescript deals with these differences. Can someone please explain? Lets say for example I want to use the google charts api and whenever possible would like to use advanced compilation. What do I use in the closure/build call, how would the ns form look like and

问题 I use Clojurescript to develop webbrowser-games. (Actually a friend of mine teaches me, we started only a few weeks ago). I wanted to generate a map in which keys are vectors and values are numbers. For e.g.: {[0 0] 0, [0 1] 1, [0 2] 2, ...}. I used this formula: (defn oxo [x y] (zipmap (map vec (combi/cartesian-product (range 0 x) (range 0 y))) (range (* x y)))) (where combi/ refers to clojure.math.combinatorics). When it generates the map, key-value pairs are ok, but they are in a random

问题 How can i use single session for both clojure and clojurescript. For my login web application Server side i am using clojure and client side clojurescript. And i need a session which is accessible from both client and server. Is that possible? 回答1: The example sente project has a session which is accessible from both client and server. You will probably need to spend some time with it and mould it to your needs. But the example itself shows logging in and then a :uid inside :session , which

问题 I'm reaching a point where GUI coding with Backbone.js object-oriented MVC pattern is getting quite complex, and looking around at other paradigms. MDV, FRP, ECS, oh my. How does Elm compare to ClojureScript? Where do they overlap? Both are languages very different from JS that compile to JS. I understand that Elm is a functional reactive programming (FRP) language. ClojureScript isn't necessarily FRP, but you can do FRP with it. Elm compiles with Haskell and ClojureScript with the JVM, so

问题 Suppose we wanted to write a cheating quine in clojure, we could do: (ns cheating-quine) ... stuff here doesn't really matter ... (println (slurp *file*)) Now, this does not work in Lein Figwheel because the value of file ends up being something like /tmp/form-init########.clj, and contains bootstrapping code of some sort. Question: how can we get this "cheating" quine to work in clojurescript? Note: the goal is NOT to write a quine. The goal is to write a cljs program which has access to the

问题 I am in clojurescript using jQuery but the answer should be the same for cljs and js I think. I have a helper function which creates creates an anchor element then puts an icon element inside of it. My anchor has a unique class for the type of button. When I do something like $('.my-btn-type').click(function(e) {console.log(e.target)}); prints if icon clicked (even though the handler is on the parent) prints if only anchor is clicked I constantly have an issue where the icon which is wrapped