How do I create an JS Object with methods and constructor in ClojureScript
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14-11-2019 - |
سؤال
Imagine the task is to create some utility lib in clojurescript so it can be used from JS.
For example, let's say I want to produce an equivalent of:
var Foo = function(a, b, c){
this.a = a;
this.b = b;
this.c = c;
}
Foo.prototype.bar = function(x){
return this.a + this.b + this.c + x;
}
var x = new Foo(1,2,3);
x.bar(3); // >> 9
One way to achieve it I came with is:
(deftype Foo [a b c])
(set! (.bar (.prototype Foo))
(fn [x]
(this-as this
(+ (.a this) (.b this) (.c this) x))))
(def x (Foo. 1 2 3))
(.bar x 3) ; >> 9
Question: is there more elegant/idiomatic way of the above in clojurescript?
المحلول
This was solved with JIRA CLJS-83 by adding a magic "Object" protocol to the deftype:
(deftype Foo [a b c]
Object
(bar [this x] (+ a b c x)))
(def afoo (Foo. 1 2 3))
(.bar afoo 3) ; >> 9
نصائح أخرى
(defprotocol IFoo
(bar [this x]))
(deftype Foo [a b c]
IFoo
(bar [_ x]
(+ a b c x)))
(def afoo (Foo. 1 2 3))
(bar afoo 3) ; >> 9
Is the idiomatic way to do this.
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