branneman

// Array = ordered + indexed + duplicate values
// a.k.a. List

const arr = [1, 2, 3]

// size
arr.length //=> 3

// random-access
arr[1] // 2

branneman

// Imperative: 'what' + 'how'
const makes1 = []
for (let i = 0; i < cars.length; i += 1) {
  makes1.push(cars[i].make)
}

// Declarative: only 'what'
const makes2 = cars.map((car) => car.make)

branneman

// Producer
const range = (min, max, acc = []) => {
  if (max < min) throw new Error('not supported!')
  if (min >= max) return acc
  return range(min + 1, max, acc.concat(min))
}

// Consumer
const lt100 = range(0, 100)
//=> [1, 2, 3, 4, ..., 97, 98, 99]

branneman

// Interface of a primitive variable: its name and type
const DEFAULT_DB_HOST = 'localhost'

// Interface of a container variable: its name, types and structures
const config = {
  user: 'readuser',
  pass: '******',
  db: 'test-env',
}

branneman

// blob = file contents, identified by hash
const blobs = {
  '73d8a': 'import x from "y"; console.log("some file contents")',
  '9c6bd': 'D8 A1 31 0F ...',
  '547d4': '# Readme\nThis is documentation',
  'a0302': '# Readme\nThis is some updated documentation',
}
 
// tree = references to blobs and trees, identified by hash
const trees = {

branneman

/**
 * Returns a list of numbers from `min` (inclusive) to `max` (exclusive).
 */
const range = (min, max, acc = []) => {
  if (max < min) throw new Error('not supported!')
  if (min >= max) return acc
  return range(min + 1, max, acc.concat(min))
}

/**

branneman

import json
from datetime import datetime, timezone

LEVELS = {
    "emergency": 7,
    "alert": 6,
    "critical": 5,
    "error": 4,
    "warning": 3,
    "notice": 2,

branneman

#lang racket/base

(require
 net/http-easy)

(define (base-url path)
  (string-append "https://httpbin.org" path))

; request:  GET
; response: plain string body

branneman

#lang racket/base

(provide
 server-start)

(require
 markdown
 net/url
 web-server/http
 web-server/servlet-env

branneman

#lang racket/base

(require (for-syntax racket/base))

; Reading Quotes
; see: https://docs.racket-lang.org/reference/reader.html
;  '    quote                #'   syntax
;  `    quasiquote           #`   quasisyntax
;  ,    unquote              #,   unsyntax
;  ,@   unquote-splicing     #,@  unsyntax-splicing