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Thomas Hansen
Thomas Hansen

Posted on • Originally published at aista.com

Hyperlambda course 101

#beginners #programming #tutorial #codenewbie

We have just created a full Hyperlambda course, where the objective is to bring you up to a full understanding of Hyperlambda in one day. The course is given as a series of YouTube videos, where I show some aspect of Hyperlambda, allowing you to repeat what I am doing, and solve exercises as we proceed. The course starts out with the hello world Hyperlambda app, but rapidly proceeds to complex subjects such as how to create code that maintains code and multi threaded programming. You can find the entire Hyperlambda course here.

Index

  • Session 1 – Hello World, Hyperlambda syntax, and the evaluator
  • Session 2 – How the Machine Creates the Code
  • Session 3 – Changing your tree with expressions and slots
  • Session 4 – Dynamic slots and executing Hyperlambda files
  • Session 5 – Multi Threaded Programming Constructs
  • Session 6 – The Angular LowCode CRUD generator
  • Session 7 – Authentication, Authorisation, JWT and RBAC
  • Session 8 – Analysing the CRUD generator’s output
  • Session 9 – Create a custom Authentication endpoint
  • Session 10 – Creating a Custom Authentication Endpoint
  • Session 11 – The [unwrap] slot
  • Session 12 – Create a CRM Exercise
  • Session 13 – Implementing a CRM System
  • Session 14 – Create a Task Management System
  • Session 15 – Creating a Task Management System
  • Session 16 – What can you use Hyperlambda for?
  • Session 17 – Record Slicing in Hyperlambda
  • Session 18 – Database and SQL slots
  • Session 19 – Branching and Looping
  • Session 20 – When the Machine Speaks with the Machine
  • Session 21 – Web Sockets in Hyperlambda
  • Session 22 – Create a Chat Client
  • Session 23 – Automatically Generated Unit Tests
  • Session 24 – Create a web API with SQL
  • Session 25 – Interceptors

Hyperlambda code

Below you can find some of the snippets and HTTP endpoints I am creating during the course. To understand what they do, please watch the above video course, and refer back to the relevant snippet when I’m using it in the course.

tutorial-01-01

.foo foo1:bar1 foo2:bar2 foo3:bar3 .foo2 foo4:bar4 foo5:bar5 .dest for-each:x:@.foo/* add:x:@.dest get-nodes:x:@.dp/#
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tutorial-02-01

.lambda http.get:"https://microsoft.com" if eq:x:@http.get .:int:200 .lambda log.info:Microsoft.com seems to be fine! else log.error:Microsoft.com is NOT OK!! lambda2hyper:x:@.lambda/* data.connect:code data.create table:snippets values content:x:@lambda2hyper
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tutorial-02-02

.lambda data.connect:code data.read table:snippets columns content limit:-1 for-each:x:@data.read/*/* add:x:@.lambda hyper2lambda:x:@.dp/# eval:x:@.lambda
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tutorial-02-03

/* * Script that formats all Hyperlambda files recursively within * the specified folder. */ .folder:/modules/northwind/ io.file.list-recursively:x:- for-each:x:-/* if strings.ends-with:x:@.dp/# .:.hl .lambda io.file.load:x:@.dp/# hyper2lambda:x:- comments:true remove-nodes:x:@hyper2lambda/*/auth.ticket.verify lambda2hyper:x:@hyper2lambda/* comments:true io.file.save:x:@.dp/# get-value:x:@lambda2hyper
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tutorial-02-04

/* * Script that formats all Hyperlambda files recursively within * the specified folder. */ .folder:/modules/northwind/ io.file.list-recursively:x:- for-each:x:-/* if strings.ends-with:x:@.dp/# .:.hl .lambda io.file.load:x:@.dp/# hyper2lambda:x:- comments:true insert-before:x:@hyper2lambda/*/data.connect . auth.ticket.verify:admin, root, guest, foo-bar lambda2hyper:x:@hyper2lambda/* comments:true io.file.save:x:@.dp/# get-value:x:@lambda2hyper
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tutorial-04-01

slots.create:foo math.add:x:@.arguments/0 get-value:x:@.arguments/1 return:x:- tutorial-04-02 slots.create:foo math.add:x:@.arguments/0 get-value:x:@.arguments/1
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tutorial-05-01

/* * Creates 4 fire and forget threads. */ fork http.get:"https://aista.com" fork http.get:"http://microsoft.com" fork http.get:"https://google.com" fork http.get:"https://dzone.com" /* * Creates 4 threads and waits for all threads to return * before it proceeds. */ join fork http.get:"https://aista.com" fork http.get:"http://microsoft.com" fork http.get:"https://google.com" fork http.get:"https://dzone.com" /* * Creates 4 sequentially invoked HTTP GET invocations. */ http.get:"https://aista.com" http.get:"http://microsoft.com" http.get:"https://google.com" http.get:"https://dzone.com"
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tutorial-05-02

// Thread number 1, loads a file, concatenates to it, and saves the file again. fork .lambda1 semaphore:semaphore-thread io.file.load:/foo.txt strings.concat get-value:x:@io.file.load .:"Appended by lambda object 1\r\n" io.file.save:/foo.txt get-value:x:@strings.concat eval:x:@.lambda1 // Thread number 2, loads a file, concatenates to it, and saves the file again. fork .lambda2 semaphore:semaphore-thread io.file.load:/foo.txt strings.concat get-value:x:@io.file.load .:"Appended by lambda object 2\r\n" io.file.save:/foo.txt get-value:x:@strings.concat eval:x:@.lambda2
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HTTP endpoints

Below you can find the Hyperlambda HTTP endpoints I am creating during the course.

tutorial01.get.hl

.arguments name:string age:int strings.concat .:"Hello there " get-value:x:@.arguments/*/name .:", you are " get-value:x:@.arguments/*/age .:" years old" unwrap:x:+/* return result:x:@strings.concat
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tutorial02.get.hl

.foo foo1:bar1 foo2:bar2 foo3:bar3 .foo2 foo4:bar4 foo5:bar5 .dest for-each:x:@.foo/* add:x:@.dest get-nodes:x:@.dp/# lambda2hyper:x:../* log.info:x:- return:x:@.dest/*
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tutorial03.get.hl

/* * Example of how to secure your API endpoint using JWT and * the internals of Hyperlambda's JWT token slots. */ // Throws an exception unless user belongs to root or admin role. auth.ticket.verify:root, admin return result:Hello World from a secure endpoint tutorial04.get.hl .data foo1:bar1 foo2:bar2 unwrap:x:+/* return value1:x:@.data/*/foo1 value2:x:@.data/*/foo2 tutorial05.get.hl .arguments name:string if eq:x:@.arguments/*/name .:Thomas .lambda return result:Hi boss! else-if eq:x:@.arguments/*/name .:John .lambda return result:Hi John! else return result:Hi stranger!
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tutorial06.post.hl

/* * Allows the caller to (securely) pass in Hyperlambda to * our endpoint and execute it, allowing the caller to * specify the logic to execute, and what data to return. */ .arguments body:* .accept:application/hyperlambda // Loading Hyperlambda from [body] argument. io.stream.read:x:@.arguments/*/body // Ensuring we return raw Hyperlambda to caller. response.headers.set Content-Type:application/hyperlambda // Transforming to Hyperlambda and adding lambda into [.lambda] object. add:x:+/*/.lambda hyper2lambda:x:@io.stream.read // [whitelist] invocation preventing malicious slots from being executed. whitelist // Slots caller is allowed to invoke. vocabulary add insert-before insert-after set-value set-name vocabulary slots.vocabulary for-each while if else-if else strings.concat return return-nodes unwrap .lambda // Returning lambda object to caller. lambda2hyper:x:@whitelist/* return:x:-
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interceptor.hl

data.connect:crm .interceptor
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foo.get.hl

data.select:select * from status return:x:-/*
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