node.js上的ClojureScript,代码 [英] ClojureScript on node.js, code
问题描述
我想在node.js上执行ClojureScript
app1.js 目标代码:working:
var rx = require(./ lib / rx / rx.node.js);
var moment = require(./ lib / moment / moment.js);
var timeStream = new rx.Observable.interval(300)
.subscribe(function(index)
{
console.log(moment dddd,MMMM Do YYYY,h:mm:ss a));
});
core.cljs 我到目前为止尝试:
(ns rxcljs.core
(:use [cljs.nodejs:only [require]])
)
(def rx(require./lib/rx/rx.node.js))
(def moment(require./lib/moment/moment.js))
( - > rx
(.Observable)
(.interval 300)
(.subscribe#( - >> b(.formatdddd,MMMM Do YYYY,h:mm:ss a)
)
(.log js / console)
)
)
)
app.js 实际编译输出:无效
.....
.....
cljs.nodejs = {};
cljs.nodejs.require = require;
cljs.nodejs.process = process;
cljs.core.string_print = cljs.nodejs.require.call(null,util)。print;
var rxcljs = {core:{}};
rxcljs.core.rx = cljs.nodejs.require.call(null,./lib/rx/rx.node.js);
rxcljs.core.moment = cljs.nodejs.require.call(null,./lib/moment/moment.js);
rxcljs.core.rx.Observable()。interval(300).subscribe(function(){
return console.log(rxcljs.core.moment.call(null).format(dddd, MMMM Do YYYY,h:mm:ss a))
});
错误:
/...../ rxcljs / app.js:12726
rxcljs.core.rx.Observable()。interval(300).subscribe(function(){
^
TypeError:无法调用未定义的方法'interval'
请咨询。
回答EDIT
(ns rxcljs.core
(:use [cljs.nodejs:only [require]])
)
(def log#(.log js / console%))
(def rx(require./lib/rx/rx.node.js))
(def moment(require./lib/moment/moment.js))
( - > rx。 - Observable
(.interval 300)
subscribe#( - >>( - >(moment)
(.formatdddd,MMMM Do YYYY,h:mm:ss a)
)
b $ b)
)
)
rx间隔正常工作尽管
(。Observable rx)
总是在ClojureScript中调用方法;对于属性访问,必须使用(.- Observable rx)
或可能(aget rxObservable)
。 sup> 1
考虑到这一点,您的 timeStream
定义可以在ClojureScript中重写:
(def time-stream
(.. rx
-Observable ;; property access
(interval 300);;方法调用
(subscribe(fn [index] ...))))
如果你发现这个偏好( js $),你也可以使用
js / rxcljs.core.rx.Observable
c $ c> magic namespace使得作为符号的名称部分给出的文本JavaScript标识符在编译的输出中使用;特别地,这意味着您需要自己提供命名空间前缀,如下所示)。
1 请注意,在Clojure中,(。foo x)
可能是一个方法调用或属性访问,取决于 x
,所以这是方言之间的区别。
I am trying to run ClojureScript on node.js
app1.js target code: working:
var rx = require("./lib/rx/rx.node.js");
var moment = require("./lib/moment/moment.js");
var timeStream = new rx.Observable.interval(300)
.subscribe(function(index)
{
console.log(moment().format("dddd, MMMM Do YYYY, h:mm:ss a"));
});
core.cljs my try so far:
(ns rxcljs.core
(:use [cljs.nodejs :only [require]])
)
(def rx (require "./lib/rx/rx.node.js"))
(def moment (require "./lib/moment/moment.js"))
(-> rx
(.Observable)
(.interval 300)
(.subscribe #(->> (->(moment)
(.format "dddd, MMMM Do YYYY, h:mm:ss a" )
)
(.log js/console)
)
)
)
app.js the actual compile output: not working
.....
.....
cljs.nodejs = {};
cljs.nodejs.require = require;
cljs.nodejs.process = process;
cljs.core.string_print = cljs.nodejs.require.call(null, "util").print;
var rxcljs = {core:{}};
rxcljs.core.rx = cljs.nodejs.require.call(null, "./lib/rx/rx.node.js");
rxcljs.core.moment = cljs.nodejs.require.call(null, "./lib/moment/moment.js");
rxcljs.core.rx.Observable().interval(300).subscribe(function() {
return console.log(rxcljs.core.moment.call(null).format("dddd, MMMM Do YYYY, h:mm:ss a"))
});
The error:
/...../rxcljs/app.js:12726
rxcljs.core.rx.Observable().interval(300).subscribe(function() {
^
TypeError: Cannot call method 'interval' of undefined
Please advice.
Answer EDIT
Thanks to Michal:
(ns rxcljs.core
(:use [cljs.nodejs :only [require]])
)
(def log #(.log js/console %))
(def rx (require "./lib/rx/rx.node.js"))
(def moment (require "./lib/moment/moment.js"))
(-> rx .-Observable
(.interval 300)
(.subscribe #(->> (-> (moment)
(.format "dddd, MMMM Do YYYY, h:mm:ss a")
)
(log)
)
)
)
rx interval working properly, moment format output is still weired though.
(.Observable rx)
is always a method call in ClojureScript; for property access, you must use (.-Observable rx)
or perhaps (aget rx "Observable")
.1
With this in mind, your timeStream
definition could be rewritten in ClojureScript like so:
(def time-stream
(.. rx
-Observable ;; property access
(interval 300) ;; method call
(subscribe (fn [index] ...))))
You could also use js/rxcljs.core.rx.Observable
if you find this prettier (the js
magic namespace causes the literal JavaScript identifier given as the name part of the symbol to be used in the compiled output; in particular, this means you need to supply the namespace prefix yourself, as shown here).
1 Note that in Clojure, (.foo x)
might be a method call or a property access depending on the x
, so that's a difference between dialects.
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