Clojure Programming Cookbook

Name: Clojure Programming Cookbook | Handle Every Problem You Come Across in the World of Clojure Programming with This Expert Collection of Recipes
Brand: Packt Publishing
Availability: OnlineOnly

Handle Every Problem You Come Across in the World of Clojure Programming with This Expert Collection of Recipes

Makoto Hashimoto(Autor*in)

Packt Publishing

1. Auflage

Erschienen am 31. August 2016

635 Seiten

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Inhalt

Cover
Copyright
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Table of Contents
Preface
Chapter 1: Live Programming with Clojure
Introduction
REPL up!
Getting ready
How to do it.
How it works.
There's more.
See also
Working with primitive data types
Getting ready
How to do it.
Using numbers
Using strings and characters
Using booleans and nil
Using symbols and keywords
How it works.
There's more.
Using bindings of vars, conditions, loops, and error handling
Getting ready
How to do it.
def and let
if and if-not
when and when-not
case and cond
do and dotimes
loop and recur
try. catch. throw
How it works.
Using and defining functions
Getting ready
How to do it.
Defining simple functions
Defining variadic functions
Defining multiple arity functions
Defining functions that specify arguments using a keyword
Defining functions with pre-condition and post-condition
How it works.
There's more.
Using third-party libraries
Getting ready
How to do it.
Adding the JAR file manually to your classpath
Using Leiningen and a project.clj file
Viewing dependencies
one-off
New dependencies at runtime
Using namespaces
Getting ready
How to do it.
Creating a new namespace
Inspecting namespaces
Adding functions with :import and :refer
Loading namespaces from files
Reloading namespaces
How to organize namespaces
There's more.
Namespace for public API
tools.namespace
What's next?
Chapter 2: Interacting with Collections
Introduction
Clojure collections and their basic functions
Getting ready
How to do it.
Lists
Vectors
Maps
Sets
How it works.
Clojure collections
Differences between lists and vectors
Clojure is immutable
There's more.
Converting collections between different types
Using distinct
Accessing and updating elements from collections
Getting ready
How to do it.
Accessing collections using the nth function
Accessing maps or sets using get
Maps, sets, and keywords are functions to access collections
Accessing a collection using second, next, ffirst, and nfirst
Using update to update collections
How it works.
There's more.
Using get for vectors
Using collections as keys in maps
Using get-in
Using assoc-in
Using update-in
Filtering elements from collections
Getting ready
How to do it.
Filtering multiples of three
Filtering items of a map
Filtering non-nil values
Removing odd values from a sequence
Using keep
Using keep-indexed
There's more.
Filter as a transducer
Filtering with core.async
Transforming and sorting collections
Getting ready
How to do it.
Using built-in sort
Migrating to sort-by
Using sorted-set
Working with sorted collection subsets
Sorting Clojure maps
Sorted map structure
Are you sorted yet?
How it works.
There's more.
Sorting lines of a file
Merging and splitting collections
Getting ready
How to do it.
Using merge and merge-with for merging
The zipmap merges keys and values for maps
Using interleave
Using split-at and split-with to split collections
How it works.
There's more.
Using group-by to split collections
Using the filter function to split collections
How to become lazy
Getting ready
How to do it.
The iterate function
Realized?
Random sequences with repeatedly
Using the macro lazy-seq
How it works.
There's more.
Other lazy-seq-producing functions
Force evaluation with doall
Lazy evaluation with files
The map function and calling rest
Chapter 3: Clojure Next
Introduction
Using destructuring techniques
Getting ready
How to do it.
Sequential destructuring
Using map destructuring
How it works.
There's more.
Sequential destructuring for string
Conditional destructing with core.match
Using functional programming style
Getting ready
How to do it.
Functions taking functions as their arguments
map
reduce
apply
Using anonymous functions
Anonymous functions using fn
Using function literals to define anonymous functions
Functions returning functions
constantly
complement
partial
comp
every-pred and some-fn
How it works.
Clojure functions are first-class functions
Pure functions
There's more.
reduce and apply
loop and recur
Using threading macros
Getting ready
How to do it.
Introducing the -& macro
Introducing the -&& macro
Introducing the cond-& and the cond-&& macros
Introducing some-& and some-&&
How it works.
There's more.
Introducing as-&
Flambo preview
Defining simple macros
Getting ready
How to do it.
Your first macro
Your second macro
How it works.
There's more.
Using quotes
Macros everywhere
Defining more advanced macros
Getting ready
How to do it.
Tracking when code was started
Logging a message with macro
How it works.
There's more.
deftest
Using protocols
Getting ready
How to do it.
Defining a record
Defining a type
Defining a protocol
How it works.
Records and types are Java classes
Differentiating between records and types
There's more.
Defining a mutable protocol and type
Defining multimethods
Getting ready
How to do it.
Defining a multimethod
How it works.
There's more.
Transducers for dummies
Getting ready
How to do it.
How it works.
Composable functions
Inserting elements
Writing your own transducers
Short circuit
There's more.
Transducers with core.async
Summing things up
Logic programming in Clojure
Getting ready
Baby logic steps
Getting to know the "o" vocabulary
conso: check for vector association
resto: check for the rest of a vector
membero
appendo: appending list
conde
Matche
Beginner logic
Keeping fresh
Finding only one result
Mature logic
Range of values
How to do it.
Generating data
Generating more data with more logic variables
Using a project
How it works.
There's more.
Validating the results of a function
Working with external data
Chapter 4: File Access and the Network
Introduction
Manipulating files and directories
Getting ready
How to do it.
spit and slurp
Reader and writer with with-open
Creating a file and directory
Copying a file
Deleting a file and a directory
Listing files and directories in a directory
How it works.
slurp and spit
with-open macro
There's more.
Reading HTTP resource
Examining the source code
Manipulating various formats of files - XML, JSON, YAML, and EDN
Getting ready
How to do it.
XML
JSON
YAML isn't a markup language
MessagePack, Clojure library
How it works.
There's more.
Extensible Data Notation
Making use of Clojure HTTP client
Getting ready
How to do it.
How it works.
There's more.
async HTTP and core async
Using queues and topics in the RabbitMQ
Getting ready
Installing RabbitMQ
How to do it.
Producing hello world messages and consuming them
Declaring the namespace and loading Langohr libraries and IP address of the Docker container
Defining a producer function
Defining a message handler and consumer
Testing producer and consumer
Using blocking consumer
How it works.
Connect to broker and open channel
How producer works
Declaring queue
Producing messages
How consumer works
Consumer messages
Defining message handler
There's more.
Using fanout exchange
fanout-producer
fanout-consumer
Running the fanout consumers
Testing fanout consumers
Using topic exchange
Topic-publisher
Topic-consumer
Running the topic consumers
Testing the topic consumers
See also
Using Kafka
Getting ready
Downloading Kafka 0.8.2.2
Start ZooKeeper and Kafka server
Create topic
Run a console consumer
Using clj-kafka
How to do it.
Declaring the namespace and load Clojure library
Producing messages
Consuming a messages
How it works.
Producing messages
Consuming messages
There's more.
Creating a new topic
See also
Using MQTT
Getting ready
Installing the MQTT broker
MQTT graphical client
Send our first MQTT message
Getting some Clojure
How to do it.
How it works.
There's more.
Streaming access to provide high performance
Getting ready
How to do it.
Streaming out
Streaming in
Streaming with line-seq
How it works.
There's more.
Using Apache Camel to connect everything
Getting ready
How to do it.
Importing Camel classes
Your first ride on Camel with Clojure
Writing more Clojure idiomatic code with Camel
How it works.
There's more.
See also
Chapter 5: Working with Other Languages
Introduction
Calling Java methods and accessing Java objects from Clojure
Getting ready
How to do it.
Instantiating objects
Calling instance methods
Calling class methods
Accessing instance fields
Accessing class fields
Accessing inner classes
Referencing classes
Using arrays
How it works.
Summary of how Clojure accesses Java methods and objects
Clojure does not inherit Java's checked exception
Summary of array accesses
Print strings of Java's primitives
There's more.
Chained calls with the double-dot macro
Using the doto macro
Using reflections
Extending Java superclasses and implementing Java interfaces
Getting ready
How to do it.
Using proxy
Using reify for implementing interfaces
How it works.
There's more.
Defining anonymous classes in Clojure
Using annotations
Calling Clojure from Java
Getting ready
How to do it.
Defining a simple named class using gen-class
Defining a class with instance methods and constructors in Clojure
Creating a JAR file callable from Java
How it works.
The project.clj for generating Java classes
AOT compilation
There's more.
Defining an interface and implementing a class callable from Java
Using Maven for Clojure and Java projects
Calling Scala from Clojure
Getting ready
How to do it.
Using Leiningen to develop Scala and Clojure
Importing Scala classes
Calling instance methods
Calling singleton methods
Accessing tuples
Accessing Scala fields
How it works.
There's more.
Using SBT
Creating an SBT-based project
Writing source code
ClojureCLR
Getting ready
Installing Visual Code Studio and creating a project
Installing Mono Studio IDE
Lein CLR
How to do it.
Calling .NET code from Clojure
Starting an REPL
Working with IO
Parsing some XML using C# code
Calling a REST API using Clojure/C#
UI Prototyping
Putting it all together
How it works.
Compiling Clojure code for .NET
Adding Clojure code to a Visual Studio project
Running Clojure code using Clojure.RT
Using Xamarin Mono Studio
There's more.
ClojureScript
Getting ready
How to do it.
Autocompiling your code
Fibonacci'ed
How it works.
Interacting with JavaScript
Using jQuery from ClojureScript
Creating a ClojureScript library
Using a third-party library
There's more.
Running in the REPL
Compiling code for both Clojure and ClojureScript
Chapter 6: Concurrency and Parallelism
Introduction
Solving concurrent problems using Clojure
Getting ready
How to do it.
Using atoms
Creating and referring atom
Updating atom
Using validator
Using CAS operation
Software Transactional Memory using ref and dosync
Creating ref
Updating refs using alter
Using ensure
Using watcher and a refined transaction code
Using commute
Using agents
Creating agents
Updating agents
How it works.
Summary of three reference types in Clojure
Coordinated/uncoordinated
Synchronous/asynchronous
How STM works in Clojure
Alter and commute
There's more.
promise and deliver
pmap, pcalls, and pvalues
pcalls
pvalues
See also
Distributed actor-based dev with Akka
Getting ready
How to do it.
Your first okku
Creating actors
Dispatching messages
How it works.
Actor system
Understanding actors
There's more.
Calling remote actors
Request and reply
See also
Using Spyglass and Couchbase to share state between JVMs
Getting ready
Setting up dependencies in project.clj
Setting up Couchbase Server as a Memcached server
Using docker-compose to start Couchbase Server
Creating a directory and a file for docker-compose
Start Couchbase cluster
Check if Docker processes are running
Summary of Couchbase cluster
Using Couchbase web administrator console
Logging into the web console
Adding nodes to the cluster
Adding Cluster
Defining Memcached bucket
How to do it.
Defining to use Spyglass library
Connecting server
Set values
Get values from another REPL
Testing time to live
Disconnecting
How it works.
What is Memcached?
Access Memcached from Telnet
Couchbase Server
There's more.
Using get-multi
Using async-get
Using CAS operations
See also
Reactive programming with meltdown
Getting ready
How to do it.
Defining a reactor
Sending a message to a reactor
Going the sync way
How it works.
Selectors
Streams
Streams and reduce
Combining functions with a graph
Custom streams
There's more.
Bridging core.async
Getting ready
Memories - reviewing core.async basics
Pub/sub
How to do it.
Async socket server
Async socket client
Chiming
There's more.
Client to Python WebSockets
Clojure WebSocket server
On Quasar/Pulsar
Getting ready
How to do it.
How it works.
Watching over other actors lifecycles
State of an actor
There's more.
Blazar
Chapter 7: Advanced Tips
Introduction
Hacking the Clojure code
Getting ready
How to do it.
How it works.
There's more.
Using Reader Conditionals, compile to Clojure, and ClojureScript
Getting ready
How to do it.
Your first Reader Conditional
Using Reader Conditionals in namespaces
How it works.
The form of Reader Conditionals and Splice macros
Macros in ClojureScript
There's more.
Building an application for Clojure and ClojureScript
Adding a cljc file for demonstrating Quil
Testing cljc code in both Clojure and ClojureScript
Building and running a demo
See also
Real-time shared development with an REPL
Getting ready
How to do it.
Shared REPLs
Using Atom and proto-repl
Using an embedded NREPL
There's more.
Custom REPL using Java interop
Server
Client
The async custom REPL server
Server REPL or more on real-time work on production code
Declarative data descriptions and validations with plumatic/schema
Getting ready
How to do it.
My first schema
Using schema for records and other types
Defining functions with validations
How it works.
Performance considerations
Generating test data
There's more.
Data coercion with prismatic/schema
Using core.typed
core.spec
Chapter 8: Web Applications
Introduction
Clojure with Vaadin - easy web widgets
Getting ready
Project settings
The Clojure/Vaadin flow
How to do it.
Using the Calendar widget
Reacting to events
Clicking a button
Using and reloading namespaces
Server-side push
There's more.
Reactive Vaadin - ideas
Reactive Vaadin - CPU monitoring
Reactive Vaadin - Telegram on Raspberry Pi
Deployment bonus
Quickly create a REST API with Liberator
Getting ready
How to do it.
Your first Liberator
Using defresource
Parameterized resources
Defining GET/POST/PUT/DELETE methods for REST APIs
How it works.
Methods and status codes of HTTP
Tracing requests
There's more.
Persistent REST resources using clojure.java.jdbc
Preparing for jdbc
Our service spec
Creating a product table and defining access functions
Defining resources and starting a server
Accessing from an HTTP client
Working with Immutant - reusing infrastructure
Getting ready
How to do it.
Simple messaging with Artemis
Remote messaging
Remote procedure call with queues
Scheduling code execution
Piping and defining data transformation pipelines
Using WebSockets made easy
There's more.
Packaging as standalone
Packaging as a deployable web archive (WAR file)
Developing with om.next, the next-generation ClojureScript library
Getting ready
Creating a new project for om.next
Updating the om version
Tips for dependencies
Starting figwheel
How to do it.
Getting started with om.next
Using states
How it works.
React fundamentals
defui
reconciler
Life cycle of components
There's more.
Task list using om.next
Defining the namespace and libraries to use
Defining state
Defining read
Defining mutate
Defining UIs
Chapter 9: Testing
Introduction
Behavior-driven development
Getting ready
Dependencies
The first feature
Designing a folder structure to organize features
How to do it.
Many assumptions with tables
Reading assumptions from a CSV file
Doing it with Excel
Doing it with web APIs and MongoDB
There's more.
VirtualBox
Freactive
Flambo, or BDD meets Apache Spark
EEP for BDD
OpenCV
Testing with random inputs and pattern-based testing
Getting ready
Libraries
Generating random values or groups of values
Random values based on schema
How to do it.
Your first test.check specification
Auto-running tests
More specifications and generators
Generators and de-structuring
Herbert
There's more.
Benchmarking with Criterium, performance tips, and other tools
Getting ready
How to do it.
Using Criterium
How it works.
Type hints
Using appropriate data types
Maps versus records versus types
Primitive arrays
Working with transient data structures
Memoize functions
There's more.
Logging with timbre and profiling with tufte
Using jvisualvm
Chapter 10: Deployment and DevOps
Introduction
Riemann - monitoring deliverance and slacking
Getting ready
Installing the Riemann service
Configuring the Riemann daemon
The Riemann dashboard
Riemann-health
Just enough dashboard configuration
Preparing to send events
How to do it.
Basic event reporting for a service
Expiring events
How it works.
There's more.
From Riemann to Slack webhooks
From Slack bots to Riemann
Deploying Clojure with Docker
Getting ready
Installing Docker on OS X or Windows
Installing Docker on Debian
Preparing the Clojure application
Packaging the application into a JAR file
Creating the Docker container
How to do it.
Connecting directly to a remote Docker
There's more.
Clojure on Amazon Web Services
Getting ready
Signing up on AWS
Getting the access key and secret access key
Setting up dependencies in your project.clj
How to do it.
Using EC2
Using S3
Using Amazon SQS
Serverless Clojure with AWS Lambda
Clojure namespace helloworld
Hello World - the AWS part
Hello Stream
Real-world Lambdas
How it works.
What is Amazon EC2?
Amazon S3
Buckets and keys
Objects
There's no more.
Index

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