Popularity
6.4
Growing
Activity
0.0
Stable
32
5
1
Programming language: Crystal
License: MIT License
Tags:
Misc
Latest version: v2.0.0
promise alternatives and similar shards
Based on the "Misc" category.
Alternatively, view promise alternatives based on common mentions on social networks and blogs.
-
sentry
Build/Runs your crystal application, watches files, and rebuilds/restarts app on file changes -
immutable
Thread-safe, persistent, immutable collections for the Crystal language -
crystagiri
An Html parser library for Crystal (like Nokogiri for Ruby) -
crz
Functional programming library for https://github.com/crystal-lang/crystal -
cron_scheduler
Simple job scheduler with crontab patterns for Crystal Language. -
inflector.cr
Inflector shard for Crystal. A port of ActiveSupport::Inflector -
crystal-web-framework-stars
⭐️ Web frameworks for Crystal, most starred on Github -
kreal
Kreal is a model sharing & RPC library built on and works with Kemal seamlessly. -
aasm.cr
:arrows_clockwise: Easy to use finite state machine for Crystal classes -
retriable.cr
Retriable.cr is a simple DSL to retry failed code blocks -
ulid
Universally Unique Lexicographically Sortable Identifier (ULID) in Crystal -
CrSerializer
Extensible annotation based serialization/deserialization library -
circuit_breaker
Implementation of the circuit breaker pattern in crystal -
burocracia.cr
No dependency Crystal shard to validate, generate and format Brazilian burocracias such as CPF, CNPJ and CEP -
wikicr
Wiki in crystal, using Markdown and Git, inspired by dokuwiki. Last features to build are pretty hard, if you have some time to help... :) -
m3u8
Generate and parse m3u8 playlists for HTTP Live Streaming (HLS) in Crystal. -
message_verifier.cr
Rails compatible MessageVerifier for Crystal-lang apps -
defined
This shard provides facilities for checking whether a constant exists at compile time, and for a variety of different conditional compilation options. Code can be conditionally compiled based on the existence of a constant, version number constraints, or whether an environment variable is set truthy or not.
Less time debugging, more time building
Scout APM allows you to find and fix performance issues with no hassle. Now with error monitoring and external services monitoring, Scout is a developer's best friend when it comes to application development.
Promo
scoutapm.com
Do you think we are missing an alternative of promise or a related project?
README
Promise.cr

A Promise Implementation in Crystal.
Installation
Add promise
to the shard.yml file as a dependency.
# shard.yml
dependencies:
promise:
github: jwaldrip/promise.cr
tag: {desired_tag}
Usage
require "promise"
require "http/client"
require "json"
def read_body(response : HTTP::Client::Response) : String
response.body
end
request = Promise(HTTP::Client::Response | JSON::Any).execute do |resolve|
HTTP::Client.get "https://httpbin.org/user-agent"
end
puts "do something else...."
request.then do |response|
JSON.parse(read_body(response as HTTP::Client::Response))
end.catch do |ex|
puts "caught!"
puts ex.message
end.then do |json_hash|
puts json_hash
end.await
Documentation
You can generate docs using crystal doc
on your local machine,
or visit: https://jwaldrip.github.com/promise-cr to view the current version's
documentation.
Contributing
See CONTRIBUTING