What is Defrecord Clojure?

Clojure allows you to create records, which are custom, maplike data types. They’re maplike in that they associate keys with values, you can look up their values the same way you can with maps, and they’re immutable like maps.

What are protocols in Clojure?

A protocol defines an abstract set of functions that can be implemented in a concrete way for a given object. Defines a protocol with one function called “foo” that acts on one parameter “x”. You can then create data structures that implements the protocol, e.g.

Are there classes in Clojure?

Clojure has gen-class, reify, proxy and also deftype and defrecord to define new class-like datatypes.

How do you define a list in Clojure?

List is a structure used to store a collection of data items. In Clojure, the List implements the ISeq interface. Lists are created in Clojure by using the list function.

Does Netflix use Clojure?

Clojure is a dynamic programming language that has been growing in popularity in recent years, seeing adoption from many developers and companies. Big names such as Adobe, Amazon, Apple, Facebook, and Netflix (among many others) all use Clojure somewhere in their tech stacks.

Who owns Clojure?


Designed by Rich Hickey
First appeared 2007
Stable release 1.11.1 / 5 April 2022
Typing discipline dynamic strong
Influenced by

What are the five types of protocols?

Types of Protocols

  • Transmission Control Protocol (TCP)
  • Internet Protocol (IP)
  • User Datagram Protocol (UDP)
  • Post office Protocol (POP)
  • Simple mail transport Protocol (SMTP)
  • File Transfer Protocol (FTP)
  • Hyper Text Transfer Protocol (HTTP)
  • Hyper Text Transfer Protocol Secure (HTTPS)

What are the four types of protocols?

Common Internet protocols include TCP/IP (Transmission Control Protocol/Internet Protocol), UDP/IP (User Datagram Protocol/Internet Protocol), HTTP (HyperText Transfer Protocol) and FTP (File Transfer Protocol).

Is Clojure an OOP?

Clojure is a functional lisp, reportedly not at all object-oriented, even though it runs on the JVM, a VM designed for an object oriented language. Clojure provides identical interfaces for iterating over lists and vectors by abstracting them to an interface called seq.

Does Clojure have garbage collection?

Since a Clojure application allocates tons of temporary objects then discards them, the garbage collector has more work to do. JVM’s default setting of -XX:ConcGCThreads tends to be lower than necessary for a Clojure application under load.

What is difference between list and string?

A string is a sequence of characters between single or double quotes. A list is a sequence of items, where each item could be anything (an integer, a float, a string, etc).

Who still uses Clojure?

Big names such as Adobe, Amazon, Apple, Facebook, and Netflix (among many others) all use Clojure somewhere in their tech stacks. And apparently, developers seem to enjoy working with it, being voted the second most loved language in 2021’s Stack Overflow Developer Survey.

Is Clojure still relevant?

Clojure is still around and a great language for experienced devs. But the experience for newcomers is much less attractive than for other languages, which is preventing growth. Also, the largest Clojure community is the Slack channel, which is hidden from the rest of the world.

Why is Clojure not popular?

Clojure may not find much popularity since it lacks sufficient Clojure-based libraries and frameworks, compared to other applications worth consideration. The lisp syntax of Clojure is also more difficult to read, and therefore could stir being unfamiliar with the tool.

What are the 3 main protocols?

There are three main types of network protocols, including network management protocols, network communication protocols and network security protocols.

What are the 3 types of protocol?

Generally speaking, there are three types of protocols in networking — communication, such as Ethernet; management, such as Simple Mail Transfer Protocol (SMTP); and security, such as Secure Shell, or SSH.

What is Clojure good for?

Clojure is designed to be a hosted language, sharing the JVM type system, GC, threads etc. All functions are compiled to JVM bytecode. Clojure is a great Java library consumer, offering the dot-target-member notation for calls to Java. Clojure supports the dynamic implementation of Java interfaces and classes.

Does clojure use JVM?

Clojure is a dynamically-typed, functional programming language that runs on the JVM (Java 5 or greater) and provides interoperability with Java. A major goal of the language is to make it easier to implement applications that access data from multiple threads (concurrency).

What is a tuple vs list?

The key difference between tuples and lists is that while tuples are immutable objects, lists are mutable. This means tuples cannot be changed while lists can be modified. Tuples are also more memory efficient than the lists.

Is array and list Same?

List is used to collect items that usually consist of elements of multiple data types. An array is also a vital component that collects several items of the same data type. List cannot manage arithmetic operations. Array can manage arithmetic operations.

What is Clojure best used for?

Does anyone still use Clojure?

The Clojure community is growing stronger

Clojure is popular among experienced developers, yet it is a community without hubris, as it’s known for being friendly to newbies.

What are the 5 elements of protocol?

Network communication protocol requires following elements :

  • Message encoding :
  • Message formatting and encapsulation :
  • Message size :
  • Message timing :
  • Message delivery options :

What are the 5 protocols?


  • Protocol 1: The mission comes first.
  • Protocol 2: Leave the future in the past.
  • Protocol 3: Don’t take a life, don’t save a life, unless otherwise directed.
  • Protocol 4: Do not reproduce.
  • Protocol 5: In the absence of direction, maintain your host’s life.

What are the 5 functions of protocol?

5 Protocol functions

  • Abstract.
  • 5.2 Synchronization.
  • 5.3 Connection management.
  • 5.4 Soft states.
  • 5.5 PDU coding/decoding.
  • 5.6 Adjustments of PDU size.