metametadata

(ns frontend.api.core
  (:require [ajax.core :as ajax]
            [cljs.core.async :refer [chan put! close!]]
            [frontend.async.core :refer [channel-error]]))

(defn <?GET [url]
  "Async. Returns a maybe-channel."
  (let [<?chan (chan)]
     (ajax/GET url
               {:handler       #(do (put! <?chan %)

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;; Synchronous Clojure trained us to use Exceptions, while asynchronous JavaScript has trained us to use Promises.
;; In contexts where we work asynchronously in Clojure (in particular ClojureScript), it can be difficult to see a definite way of managing failure. Here are some proposals.

;; OPTION 1: adapting exception handling to core.async CSPs
;; As proposed by David Nolen, with some macro sugar we use Exceptions in go blocks with core async in the same way we would do with synchronous code.

(require '[clojure.core.async :as a :refer [go]])

;; defining some helper macros
(defn throw-err "Throw if is error, will be different in ClojureScript"

past

// -sp-context:browser
// Open this file in scratchpad and run it. Output goes to the Browser Console (Cmd-Shift-J).

Components.utils.import("resource://gre/modules/devtools/dbg-server.jsm");
Components.utils.import("resource://gre/modules/devtools/dbg-client.jsm");
let { devtools } = Cu.import("resource://gre/modules/devtools/Loader.jsm", {});
let { StyleSheetsFront } = devtools.require("devtools/server/actors/stylesheets");

let client;

danking

#lang racket
(require parser-tools/lex
         (prefix-in re- parser-tools/lex-sre)
         parser-tools/yacc)
(provide (all-defined-out))

(define-tokens a (NUM VAR))
(define-empty-tokens b (+ - EOF LET IN))
(define-lex-trans number
  (syntax-rules ()