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Hack vs Kotlin: What are the differences?

Developers describe Hack as "A programming language for HHVM that interoperates seamlessly with PHP". Hack provides instantaneous type checking via a local server that watches the filesystem. It typically runs in less than 200 milliseconds, making it easy to integrate into your development workflow without introducing a noticeable delay. On the other hand, Kotlin is detailed as "Statically typed Programming Language targeting JVM and JavaScript". Kotlin is a statically typed programming language for the JVM, Android and the browser, 100% interoperable with Java.

Hack and Kotlin can be categorized as "Languages" tools.

"Interoperates seamlessly with php" is the top reason why over 5 developers like Hack, while over 28 developers mention "Interoperable with Java" as the leading cause for choosing Kotlin.

Kotlin is an open source tool with 28.3K GitHub stars and 3.28K GitHub forks. Here's a link to Kotlin's open source repository on GitHub.

Slack, 9GAG, and Rainist are some of the popular companies that use Kotlin, whereas Hack is used by Facebook, Slack, and Wizters. Kotlin has a broader approval, being mentioned in 268 company stacks & 208 developers stacks; compared to Hack, which is listed in 8 company stacks and 3 developer stacks.

- No public GitHub repository available -

What is Hack?

Hack provides instantaneous type checking via a local server that watches the filesystem. It typically runs in less than 200 milliseconds, making it easy to integrate into your development workflow without introducing a noticeable delay.

What is Kotlin?

Kotlin is a statically typed programming language for the JVM, Android and the browser, 100% interoperable with Java
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    What are some alternatives to Hack and Kotlin?
    PHP
    Fast, flexible and pragmatic, PHP powers everything from your blog to the most popular websites in the world.
    JavaScript
    JavaScript is most known as the scripting language for Web pages, but used in many non-browser environments as well such as node.js or Apache CouchDB. It is a prototype-based, multi-paradigm scripting language that is dynamic,and supports object-oriented, imperative, and functional programming styles.
    Python
    Python is a general purpose programming language created by Guido Van Rossum. Python is most praised for its elegant syntax and readable code, if you are just beginning your programming career python suits you best.
    Java
    Java is a programming language and computing platform first released by Sun Microsystems in 1995. There are lots of applications and websites that will not work unless you have Java installed, and more are created every day. Java is fast, secure, and reliable. From laptops to datacenters, game consoles to scientific supercomputers, cell phones to the Internet, Java is everywhere!
    HTML5
    HTML5 is a core technology markup language of the Internet used for structuring and presenting content for the World Wide Web. As of October 2014 this is the final and complete fifth revision of the HTML standard of the World Wide Web Consortium (W3C). The previous version, HTML 4, was standardised in 1997.
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    Decisions about Hack and Kotlin
    StackShare Editors
    StackShare Editors
    PHP
    PHP
    Hack
    Hack
    HHVM (HipHop Virtual Machine)
    HHVM (HipHop Virtual Machine)

    Throughout 2016, Slack began migrating from PHP5 to Hack. They cite several well-known challenges inherent to PHP, including surprise type conversions, inconsistency around reference semantics, inconsistencies in the standard library, and the fact that “PHP tries very, very hard to keep the request running, even if it has done something deeply strange.”

    To overcome these challenges while maintaining the unique values of PHP, Slack turned to Hack, a gradual typing system for PHP. Hack runs on the HipHop Virtual Machine, or HHVM, an open source just-in-time (JIT) environment for PHP.

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    StackShare Editors
    StackShare Editors
    Ruby
    Ruby
    Go
    Go
    gRPC
    gRPC
    Kotlin
    Kotlin

    As the WeWork footprint continued to expand, in mid-2018 the team began to explore the next generation of identity management to handle the global scale of the business.

    The team decided to vet three languages for building microservices: Go, Kotlin, and Ruby. They compared the three by building a component of an identity system in each, and assessing the performance apples-to-apples.

    After building out the systems and load testing each one, the team decided to implement the new system in Go for a few reasons. In addition to better performance under heavy loads, Go, according to the team, is a simpler language that will constrain developers to simpler code. Additionally, the development lifecycle is simpler with Go, since “there is little difference between running a service directly on a dev machine, to running it in a container, to running clustered instances of the service.”

    In the implementation, they the Go grpc framework to handle various common infrastructure patterns, resulting in “in a clean common server pattern that we can reuse across our microservices.”

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    StackShare Editors
    StackShare Editors
    Prometheus
    Prometheus
    Chef
    Chef
    Consul
    Consul
    Memcached
    Memcached
    Hack
    Hack
    Swift
    Swift
    Hadoop
    Hadoop
    Terraform
    Terraform
    Airflow
    Airflow
    Apache Spark
    Apache Spark
    Kubernetes
    Kubernetes
    gRPC
    gRPC
    HHVM (HipHop Virtual Machine)
    HHVM (HipHop Virtual Machine)
    Presto
    Presto
    Kotlin
    Kotlin
    Apache Thrift
    Apache Thrift

    Since the beginning, Cal Henderson has been the CTO of Slack. Earlier this year, he commented on a Quora question summarizing their current stack.

    Apps
    • Web: a mix of JavaScript/ES6 and React.
    • Desktop: And Electron to ship it as a desktop application.
    • Android: a mix of Java and Kotlin.
    • iOS: written in a mix of Objective C and Swift.
    Backend
    • The core application and the API written in PHP/Hack that runs on HHVM.
    • The data is stored in MySQL using Vitess.
    • Caching is done using Memcached and MCRouter.
    • The search service takes help from SolrCloud, with various Java services.
    • The messaging system uses WebSockets with many services in Java and Go.
    • Load balancing is done using HAproxy with Consul for configuration.
    • Most services talk to each other over gRPC,
    • Some Thrift and JSON-over-HTTP
    • Voice and video calling service was built in Elixir.
    Data warehouse
    • Built using open source tools including Presto, Spark, Airflow, Hadoop and Kafka.
    Etc
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    Interest over time
    Reviews of Hack and Kotlin
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    How developers use Hack and Kotlin
    Avatar of Philtard
    Philtard uses KotlinKotlin

    Even though still a young language, it feels so at home sitting in the springboot frame and works with vaadin just great. And in itself it has like all the best parts of java, scala, python mixed into one.

    Avatar of fileee GmbH
    fileee GmbH uses KotlinKotlin

    We use Kotlin both in our Android App and increasingly in our polyglot backend services.

    Avatar of claudiofus
    claudiofus uses KotlinKotlin

    Statically typed programming language for modern multiplatform applications.

    Avatar of Cirrus Labs
    Cirrus Labs uses KotlinKotlin

    All 20+ micro-services that power Cirrus CI are written in Kotlin.

    Avatar of movix
    movix uses KotlinKotlin

    Unit tests, backend with Spring Boot

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