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promesa.core


aletcljmacro

(alet bindings & body)

A let alternative that always returns promise and allows use await marker function in order to emulate the async/await syntax and make the let expression look like synchronous where async operations are performed.

A `let` alternative that always returns promise and allows
use `await` marker function in order to emulate the async/await
syntax and make the let expression look like synchronous where
async operations are performed.
sourceraw docstring

allclj/s

(all promises)

Given an array of promises, return a promise that is fulfilled when all the items in the array are fulfilled.

Given an array of promises, return a promise
that is fulfilled  when all the items in the
array are fulfilled.
sourceraw docstring

anyclj/s

(any promises)

Given an array of promises, return a promise that is fulfilled when first one item in the array is fulfilled.

Given an array of promises, return a promise
that is fulfilled when first one item in the
array is fulfilled.
sourceraw docstring

attemptclj/s

(attempt callback)

A helper for start promise chain without worry about synchronous or asynchronous exceptions. Returns a promise resolved with the return value of the callback.

A helper for start promise chain without worry about
synchronous or asynchronous exceptions. Returns a promise
resolved with the return value of the callback.
sourceraw docstring

awaitclj/s

(await & args)
source

bindclj/s

(bind p f)

A chain helper for promises.

A chain helper for promises.
sourceraw docstring

branchclj/s

(branch p success failure)
source

cancel!clj/s

(cancel! p)

Cancel the promise.

Cancel the promise.
sourceraw docstring

cancelled?clj/s

(cancelled? v)

Return true if v is a cancelled promise.

Return true if `v` is a cancelled promise.
sourceraw docstring

catchclj/s

(catch p f)
(catch p pred-or-type f)

Catch all promise chain helper.

Catch all promise chain helper.
sourceraw docstring

chainclj/s

(chain p & funcs)

Like then but accepts multiple parameters.

Like then but accepts multiple parameters.
sourceraw docstring

delayclj/s

(delay t)
(delay t v)

Given a timeout in miliseconds and optional value, returns a promise that will fulfilled with provided value (or nil) after the time is reached.

Given a timeout in miliseconds and optional
value, returns a promise that will fulfilled
with provided value (or nil) after the
time is reached.
sourceraw docstring

do*cljmacro

(do* & body)

A sugar syntax on top of attempt.

A sugar syntax on top of `attempt`.
sourceraw docstring

done?clj/s

Returns true if promise p is already done.

Returns true if promise `p` is already done.
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errclj/s

A short alias for error function.

A short alias for `error` function.
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errorclj/s

(error f p)
(error f type p)

Same as catch but with parameters inverted.

Same as `catch` but with parameters inverted.
sourceraw docstring

extractclj/s

(extract p)

Returns the current promise value.

Returns the current promise value.
sourceraw docstring

finallyclj/s

(finally p callback)

Attach handler to promise that will be executed independently if promise is resolved or rejected.

Attach handler to promise that will be
executed independently if promise is
resolved or rejected.
sourceraw docstring

mapclj/s

(map f p)

Apply a function to the promise value and return a new promise with the result.

Apply a function to the promise value and
return a new promise with the result.
sourceraw docstring

mapcatclj/s

(mapcat f p)

Same as map but removes one level of promise neesting. Useful when the map function returns a promise instead of value.

In JS environment this function is analogous to map because the promise abstraction overloads the map operator.

Same as `map` but removes one level of
promise neesting. Useful when the map function
returns a promise instead of value.

In JS environment this function is analogous
to `map` because the promise abstraction overloads
the `map` operator.
sourceraw docstring

pending?clj/s

(pending? p)

Returns true if promise p is stil pending.

Returns true if promise `p` is stil pending.
sourceraw docstring

promiseclj/s

(promise v)

The promise constructor.

The promise constructor.
sourceraw docstring

Promisecljs

source

promise?clj/s

(promise? v)

Return true if v is a promise instance.

Return true if `v` is a promise instance.
sourceraw docstring

promisifyclj/s

(promisify callable)

Given a function that accepts a callback as the last argument return other function that returns a promise. Callback is expected to take single parameter (result of a computation).

Given a function that accepts a callback as the last argument return other
function that returns a promise. Callback is expected to take single
parameter (result of a computation).
sourceraw docstring

rejectedclj/s

(rejected v)

Return a rejected promise with provided reason.

Return a rejected promise with provided reason.
sourceraw docstring

rejected?clj/s

(rejected? p)

Returns true if promise p is already rejected.

Returns true if promise `p` is already rejected.
sourceraw docstring

resolvedclj/s

(resolved v)

Return a resolved promise with provided value.

Return a resolved promise with provided value.
sourceraw docstring

resolved?clj/s

(resolved? p)

Returns true if promise p is already fulfilled.

Returns true if promise `p` is already fulfilled.
sourceraw docstring

scheduleclj/s

(schedule ms func)

Schedule a callable to be executed after the ms delay is reached.

In JVM it uses a scheduled executor service and in JS it uses the setTimeout function.

Schedule a callable to be executed after the `ms` delay
is reached.

In JVM it uses a scheduled executor service and in JS
it uses the `setTimeout` function.
sourceraw docstring

set-executor!clj

(set-executor! executor)

Replace the default executor instance with your own instance.

Replace the default executor instance with
your own instance.
sourceraw docstring

thenclj/s

(then p f)

Similar to map but with parameters inverted for convenience and for familiarity with javascript's promises .then operator.

Unlike Clojure's map, will resolve any promises returned by f.

Similar to `map` but with parameters inverted
for convenience and for familiarity with
javascript's promises `.then` operator.

Unlike Clojure's `map`, will resolve any promises
returned  by `f`.
sourceraw docstring

timeoutcljs

(timeout p t)
(timeout p t v)

Returns a cancellable promise that will be fulfilled with this promise's fulfillment value or rejection reason. However, if this promise is not fulfilled or rejected within ms milliseconds, the returned promise is cancelled with a TimeoutError

Returns a cancellable promise that will be fulfilled
with this promise's fulfillment value or rejection reason.
However, if this promise is not fulfilled or rejected
within `ms` milliseconds, the returned promise is cancelled
with a TimeoutError
sourceraw docstring

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