Promise

Package Promise - lisp (JSCL) wrap for JavaScript Promise.

It is intended for use in the Moren environment.

Status

Development

Compilation

   (lores:qload :promise :storejs t)
   (lores:modlink :promise "prom.js")

Use

(setq p1 (promise:make
            (lambda (res rej)
                 (#j:setTimeout
                     (lambda () (case (random 2)
                                  (0 (funcall rej "no"))
                                  (1 (funcall res "yes")))) 100)))
(promise:is-promise p1)
;;=> t

(promise:then p1 
              (lambda (x) (print (list 'accepted x)))
              (lambda (x) (print (list 'rejected x)))))

(promise:_catch
    (promise:then-resolve p1 (lambda (x) (print (list 'accepted x))))
    (lambda (x) (print (list 'rejected x))))

(promise:then-resolve (promise:all (promise:resolve 1) (promise:resolve 2)))

Promisify

For example we use pify.

                                                             
(setf #j:pify (require "pify"))

(defun somefn (arg1 arg2 callback &rest other)
    ;; some code
    (if flag 
       (funcall callback nil arg1) ;; its (resolve arg1)
       (funcall callback arg2 nil)) ;; its (reject arg2)
))

(promise:then (funcall (#j:pify #'somefn) 123 456)
              (lambda (x) (print x))  ;; => resolve 123
              (lambda (x) (print x))) ;; => rejected 456

Copyright

Copyright © 2017,2018 Vladimir Mezentsev

License

GNU General Public License v3.0