Add basic functionality

z1-prototype/menu.js

@@ -0,0 +1,34 @@
+const VendingMachine = require('./vendingMachine');
+let vendingMachine = new VendingMachine();
+
+const readline = require('readline-sync');
+
+function setupMachine() {
+    vendingMachine.fillMachine();
+}
+
+function listProducts() {
+    const products = vendingMachine.getProducts();
+    products.forEach((element) => {
+        if (element.quantity > 0) {
+            console.log(`${element.id}) ${element.name} - ${element.price}zł`);
+        }
+    });
+}
+
+(async () => {
+    setupMachine();
+    let credit = readline.question(`Insert coins:\n`);
+    listProducts();
+    let id = readline.question(`Choose product from the list:\n`);
+    let product = vendingMachine.getProductById(id);
+    if (product.price > credit) {
+        console.log('Insuficient credit');
+    } else {
+        console.log(
+            'Your change ',
+            vendingMachine.calculateChange(credit - product.price)
+        );
+        console.log('Please take your product');
+    }
+})();

z1-prototype/node_modules/readline-sync/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 anseki
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

z1-prototype/node_modules/readline-sync/README-Deprecated.md

@@ -0,0 +1,89 @@
+# readlineSync
+
+## <a name="deprecated_methods_and_options"></a>Deprecated Methods and Options
+
+The readlineSync current version is fully compatible with older version.  
+The following methods and options are deprecated.
+
+### <a name="deprecated_methods_and_options-setprint_method"></a>`setPrint` method
+
+Use the [`print`](README.md#basic_options-print) option.  
+For the [Default Options](README.md#basic_options), use:
+
+```js
+readlineSync.setDefaultOptions({print: value});
+```
+
+instead of:
+
+```js
+readlineSync.setPrint(value);
+```
+
+### <a name="deprecated_methods_and_options-setprompt_method"></a>`setPrompt` method
+
+Use the [`prompt`](README.md#basic_options-prompt) option.  
+For the [Default Options](README.md#basic_options), use:
+
+```js
+readlineSync.setDefaultOptions({prompt: value});
+```
+
+instead of:
+
+```js
+readlineSync.setPrompt(value);
+```
+
+### <a name="deprecated_methods_and_options-setencoding_method"></a>`setEncoding` method
+
+Use the [`encoding`](README.md#basic_options-encoding) option.  
+For the [Default Options](README.md#basic_options), use:
+
+```js
+readlineSync.setDefaultOptions({encoding: value});
+```
+
+instead of:
+
+```js
+readlineSync.setEncoding(value);
+```
+
+### <a name="deprecated_methods_and_options-setmask_method"></a>`setMask` method
+
+Use the [`mask`](README.md#basic_options-mask) option.  
+For the [Default Options](README.md#basic_options), use:
+
+```js
+readlineSync.setDefaultOptions({mask: value});
+```
+
+instead of:
+
+```js
+readlineSync.setMask(value);
+```
+
+### <a name="deprecated_methods_and_options-setbuffersize_method"></a>`setBufferSize` method
+
+Use the [`bufferSize`](README.md#basic_options-buffersize) option.  
+For the [Default Options](README.md#basic_options), use:
+
+```js
+readlineSync.setDefaultOptions({bufferSize: value});
+```
+
+instead of:
+
+```js
+readlineSync.setBufferSize(value);
+```
+
+### <a name="deprecated_methods_and_options-noechoback_option"></a>`noEchoBack` option
+
+Use [`hideEchoBack`](README.md#basic_options-hideechoback) option instead of it.
+
+### <a name="deprecated_methods_and_options-notrim_option"></a>`noTrim` option
+
+Use [`keepWhitespace`](README.md#basic_options-keepwhitespace) option instead of it.

z1-prototype/node_modules/readline-sync/lib/encrypt.js

@@ -0,0 +1,24 @@
+/*
+ * readlineSync
+ * https://github.com/anseki/readline-sync
+ *
+ * Copyright (c) 2019 anseki
+ * Licensed under the MIT license.
+ */
+
+var cipher = require('crypto').createCipher(
+      process.argv[2] /*algorithm*/, process.argv[3] /*password*/),
+  stdin = process.stdin,
+  stdout = process.stdout,
+  crypted = '';
+
+stdin.resume();
+stdin.setEncoding('utf8');
+stdin.on('data', function(d) {
+  crypted += cipher.update(d, 'utf8', 'hex');
+});
+stdin.on('end', function() {
+  stdout.write(crypted + cipher.final('hex'), 'binary', function() {
+    process.exit(0);
+  });
+});

z1-prototype/node_modules/readline-sync/lib/read.cs.js

@@ -0,0 +1,123 @@
+/* jshint wsh:true */
+
+/*
+ * readlineSync
+ * https://github.com/anseki/readline-sync
+ *
+ * Copyright (c) 2019 anseki
+ * Licensed under the MIT license.
+ */
+
+var
+  FSO_ForReading = 1, FSO_ForWriting = 2,
+  PS_MSG = 'Microsoft Windows PowerShell is required.' +
+    ' https://technet.microsoft.com/en-us/library/hh847837.aspx',
+
+  input = '', fso, tty,
+  options = (function(conf) {
+    var options = {}, arg, args =// Array.prototype.slice.call(WScript.Arguments),
+      (function() {
+        var args = [], i, iLen;
+        for (i = 0, iLen = WScript.Arguments.length; i < iLen; i++)
+          { args.push(WScript.Arguments(i)); }
+        return args;
+      })(),
+      confLc = {}, key;
+
+    function decodeArg(arg) {
+      return arg.replace(/#(\d+);/g, function(str, charCode) {
+        return String.fromCharCode(+charCode);
+      });
+    }
+
+    for (key in conf) {
+      if (conf.hasOwnProperty(key))
+        { confLc[key.toLowerCase()] = {key: key, type: conf[key]}; }
+    }
+
+    while (typeof(arg = args.shift()) === 'string') {
+      if (!(arg = (arg.match(/^\-+(.+)$/) || [])[1])) { continue; }
+      arg = arg.toLowerCase();
+      if (confLc[arg]) {
+        options[confLc[arg].key] =
+          confLc[arg].type === 'boolean' ? true :
+          confLc[arg].type === 'string' ? args.shift() : null;
+      }
+    }
+    for (key in conf) {
+      if (conf.hasOwnProperty(key) && conf[key] === 'string') {
+        if (typeof options[key] !== 'string') { options[key] = ''; }
+        else { options[key] = decodeArg(options[key]); }
+      }
+    }
+    return options;
+  })({
+    display:        'string',
+    displayOnly:    'boolean',
+    keyIn:          'boolean',
+    hideEchoBack:   'boolean',
+    mask:           'string'
+  });
+
+if (!options.hideEchoBack && !options.keyIn) {
+  if (options.display) { writeTTY(options.display); }
+  if (!options.displayOnly) { input = readByFSO(); }
+} else if (options.hideEchoBack && !options.keyIn && !options.mask) {
+  if (options.display) { writeTTY(options.display); }
+  if (!options.displayOnly) { input = readByPW(); }
+} else {
+  WScript.StdErr.WriteLine(PS_MSG);
+  WScript.Quit(1);
+}
+
+WScript.StdOut.Write('\'' + input + '\'');
+
+WScript.Quit();
+
+function writeTTY(text) {
+  try {
+    tty = tty || getFso().OpenTextFile('CONOUT$', FSO_ForWriting, true);
+    tty.Write(text);
+  } catch (e) {
+    WScript.StdErr.WriteLine('TTY Write Error: ' + e.number +
+      '\n' + e.description + '\n' + PS_MSG);
+    WScript.Quit(e.number || 1);
+  }
+}
+
+function readByFSO() {
+  var text;
+  try {
+    text = getFso().OpenTextFile('CONIN$', FSO_ForReading).ReadLine();
+  } catch (e) {
+    WScript.StdErr.WriteLine('TTY Read Error: ' + e.number +
+      '\n' + e.description + '\n' + PS_MSG);
+    WScript.Quit(e.number || 1);
+  }
+  return text;
+}
+
+// TTY must be STDIN that is not redirected and not piped.
+function readByPW() {
+  var text;
+  try {
+    text = WScript.CreateObject('ScriptPW.Password').GetPassword()
+      // Bug? Illegal data may be returned when user types before initializing.
+      .replace(/[\u4000-\u40FF]/g, function(chr) {
+        var charCode = chr.charCodeAt(0);
+        return charCode >= 0x4020 && charCode <= 0x407F ?
+          String.fromCharCode(charCode - 0x4000) : '';
+      });
+  } catch (e) {
+    WScript.StdErr.WriteLine('ScriptPW.Password Error: ' + e.number +
+      '\n' + e.description + '\n' + PS_MSG);
+    WScript.Quit(e.number || 1);
+  }
+  writeTTY('\n');
+  return text;
+}
+
+function getFso() {
+  if (!fso) { fso = new ActiveXObject('Scripting.FileSystemObject'); }
+  return fso;
+}

z1-prototype/node_modules/readline-sync/lib/read.ps1

@@ -0,0 +1,128 @@
+# readlineSync
+# https://github.com/anseki/readline-sync
+#
+# Copyright (c) 2019 anseki
+# Licensed under the MIT license.
+
+Param(
+  [string] $display,
+  [switch] $displayOnly,
+  [switch] $keyIn,
+  [switch] $hideEchoBack,
+  [string] $mask,
+  [string] $limit,
+  [switch] $caseSensitive
+)
+
+$ErrorActionPreference = 'Stop' # for cmdlet
+trap {
+  # `throw $_` and `Write-Error $_` return exit-code 0
+  $Host.UI.WriteErrorLine($_)
+  exit 1
+}
+
+function decodeArg ($arg) {
+  [Regex]::Replace($arg, '#(\d+);', { [char][int] $args[0].Groups[1].Value })
+}
+
+$options = @{}
+foreach ($arg in @('display', 'displayOnly', 'keyIn', 'hideEchoBack', 'mask', 'limit', 'caseSensitive')) {
+  $options.Add($arg, (Get-Variable $arg -ValueOnly))
+}
+$argList = New-Object string[] $options.Keys.Count
+$options.Keys.CopyTo($argList, 0)
+foreach ($arg in $argList) {
+  if ($options[$arg] -is [string] -and $options[$arg])
+    { $options[$arg] = decodeArg $options[$arg] }
+}
+
+[string] $inputTTY = ''
+[bool] $silent = -not $options.display -and
+  $options.keyIn -and $options.hideEchoBack -and -not $options.mask
+[bool] $isCooked = -not $options.hideEchoBack -and -not $options.keyIn
+
+# Instant method that opens TTY without CreateFile via P/Invoke in .NET Framework
+# **NOTE** Don't include special characters of DOS in $command when $getRes is True.
+# [string] $cmdPath = $Env:ComSpec
+# [string] $psPath = 'powershell.exe'
+function execWithTTY ($command, $getRes = $False, $throwError = $False) {
+  if ($getRes) {
+    $res = (cmd.exe /C "<CON powershell.exe -Command $command")
+    if ($LastExitCode -ne 0) {
+      if ($throwError) { throw $LastExitCode }
+      else { exit $LastExitCode }
+    }
+    return $res
+  } else {
+    $command | cmd.exe /C ">CON powershell.exe -Command -"
+    if ($LastExitCode -ne 0) {
+      if ($throwError) { throw $LastExitCode }
+      else { exit $LastExitCode }
+    }
+  }
+}
+
+function writeTTY ($text) {
+  execWithTTY ('Write-Host (''' +
+    (($text -replace '''', '''''') -replace '[\r\n]', '''+"`n"+''') + ''') -NoNewline')
+}
+
+if ($options.display) {
+  writeTTY $options.display
+}
+if ($options.displayOnly) { return "''" }
+
+if (-not $options.keyIn -and $options.hideEchoBack -and $options.mask -eq '*') {
+  # It fails when it's not ready.
+  try {
+    $inputTTY = execWithTTY ('$text = Read-Host -AsSecureString;' +
+      '$bstr = [Runtime.InteropServices.Marshal]::SecureStringToBSTR($text);' +
+      '[Runtime.InteropServices.Marshal]::PtrToStringAuto($bstr)') $True $True
+    return '''' + $inputTTY + ''''
+  } catch {} # ignore
+}
+
+if ($options.keyIn) { $reqSize = 1 }
+
+if ($options.keyIn -and $options.limit) {
+  $limitPtn = '[^' + $options.limit + ']'
+}
+
+while ($True) {
+  if (-not $isCooked) {
+    $chunk = [char][int] (execWithTTY '[int] [Console]::ReadKey($True).KeyChar' $True)
+  } else {
+    $chunk = execWithTTY 'Read-Host' $True
+    $chunk += "`n"
+  }
+
+  if ($chunk -and $chunk -match '^(.*?)[\r\n]') {
+    $chunk = $Matches[1]
+    $atEol = $True
+  } else { $atEol = $False }
+
+  # other ctrl-chars
+  if ($chunk) { $chunk = $chunk -replace '[\x00-\x08\x0b\x0c\x0e-\x1f\x7f]', '' }
+  if ($chunk -and $limitPtn) {
+    if ($options.caseSensitive)   { $chunk = $chunk -creplace $limitPtn, '' }
+    else                          { $chunk = $chunk -ireplace $limitPtn, '' }
+  }
+
+  if ($chunk) {
+    if (-not $isCooked) {
+      if (-not $options.hideEchoBack) {
+        writeTTY $chunk
+      } elseif ($options.mask) {
+        writeTTY ($options.mask * $chunk.Length)
+      }
+    }
+    $inputTTY += $chunk
+  }
+
+  if ((-not $options.keyIn -and $atEol) -or
+    ($options.keyIn -and $inputTTY.Length -ge $reqSize)) { break }
+}
+
+if (-not $isCooked -and -not $silent) { execWithTTY 'Write-Host ''''' } # new line
+
+return "'$inputTTY'"

z1-prototype/node_modules/readline-sync/lib/read.sh

@@ -0,0 +1,137 @@
+# readlineSync
+# https://github.com/anseki/readline-sync
+#
+# Copyright (c) 2019 anseki
+# Licensed under the MIT license.
+
+# Use perl for compatibility of sed/awk of GNU / POSIX, BSD. (and tr)
+# Hide "\n" from shell by "\fNL"
+
+decode_arg() {
+  printf '%s' "$(printf '%s' "$1" | perl -pe 's/#(\d+);/sprintf("%c", $1)/ge; s/[\r\n]/\fNL/g')"
+}
+
+# getopt(s)
+while [ $# -ge 1 ]; do
+  arg="$(printf '%s' "$1" | grep -E '^-+[^-]+$' | tr '[A-Z]' '[a-z]' | tr -d '-')"
+  case "$arg" in
+    'display')          shift; options_display="$(decode_arg "$1")";;
+    'displayonly')      options_displayOnly=true;;
+    'keyin')            options_keyIn=true;;
+    'hideechoback')     options_hideEchoBack=true;;
+    'mask')             shift; options_mask="$(decode_arg "$1")";;
+    'limit')            shift; options_limit="$(decode_arg "$1")";;
+    'casesensitive')    options_caseSensitive=true;;
+  esac
+  shift
+done
+
+reset_tty() {
+  if [ -n "$save_tty" ]; then
+    stty --file=/dev/tty "$save_tty" 2>/dev/null || \
+      stty -F /dev/tty "$save_tty" 2>/dev/null || \
+      stty -f /dev/tty "$save_tty" || exit $?
+  fi
+}
+trap 'reset_tty' EXIT
+save_tty="$(stty --file=/dev/tty -g 2>/dev/null || stty -F /dev/tty -g 2>/dev/null || stty -f /dev/tty -g || exit $?)"
+
+[ -z "$options_display" ] && [ "$options_keyIn" = true ] && \
+  [ "$options_hideEchoBack" = true ] && [ -z "$options_mask" ] && silent=true
+[ "$options_hideEchoBack" != true ] && [ "$options_keyIn" != true ] && is_cooked=true
+
+write_tty() {
+  # if [ "$2" = true ]; then
+  #   printf '%b' "$1" >/dev/tty
+  # else
+  #   printf '%s' "$1" >/dev/tty
+  # fi
+  printf '%s' "$1" | perl -pe 's/\fNL/\r\n/g' >/dev/tty
+}
+
+replace_allchars() { (
+  text=''
+  for i in $(seq 1 ${#1})
+  do
+    text="$text$2"
+  done
+  printf '%s' "$text"
+) }
+
+if [ -n "$options_display" ]; then
+  write_tty "$options_display"
+fi
+if [ "$options_displayOnly" = true ]; then
+  printf "'%s'" ''
+  exit 0
+fi
+
+if [ "$is_cooked" = true ]; then
+  stty --file=/dev/tty cooked 2>/dev/null || \
+    stty -F /dev/tty cooked 2>/dev/null || \
+    stty -f /dev/tty cooked || exit $?
+else
+  stty --file=/dev/tty raw -echo 2>/dev/null || \
+    stty -F /dev/tty raw -echo 2>/dev/null || \
+    stty -f /dev/tty raw -echo || exit $?
+fi
+
+[ "$options_keyIn" = true ] && req_size=1
+
+if [ "$options_keyIn" = true ] && [ -n "$options_limit" ]; then
+  if [ "$options_caseSensitive" = true ]; then
+    limit_ptn="$options_limit"
+  else
+    # Safe list
+    # limit_ptn="$(printf '%s' "$options_limit" | sed 's/\([a-z]\)/\L\1\U\1/ig')"
+    limit_ptn="$(printf '%s' "$options_limit" | perl -pe 's/([a-z])/lc($1) . uc($1)/ige')"
+  fi
+fi
+
+while :
+do
+  if [ "$is_cooked" != true ]; then
+    # chunk="$(dd if=/dev/tty bs=1 count=1 2>/dev/null)"
+    chunk="$(dd if=/dev/tty bs=1 count=1 2>/dev/null | perl -pe 's/[\r\n]/\fNL/g')"
+  else
+    IFS= read -r chunk </dev/tty || exit $?
+    chunk="$(printf '%s\fNL' "$chunk")"
+  fi
+
+  # if [ -n "$chunk" ] && [ "$(printf '%s' "$chunk" | tr '\r' '\n' | wc -l)" != "0" ]; then
+  #   chunk="$(printf '%s' "$chunk" | tr '\r' '\n' | head -n 1)"
+  if [ -n "$chunk" ] && printf '%s' "$chunk" | perl -ne '/\fNL/ or exit 1'; then
+    chunk="$(printf '%s' "$chunk" | perl -pe 's/^(.*?)\fNL.*$/$1/')"
+    at_eol=true
+  fi
+
+  # other ctrl-chars
+  if [ -n "$chunk" ]; then
+    # chunk="$(printf '%s' "$chunk" | tr -d '\00-\10\13\14\16-\37\177')"
+    # for System V
+    chunk="$(printf '%s' "$chunk" | tr -d '\00\01\02\03\04\05\06\07\10\13\14\16\17\20\21\22\23\24\25\26\27\30\31\32\33\34\35\36\37\177')"
+  fi
+  if [ -n "$chunk" ] && [ -n "$limit_ptn" ]; then
+    chunk="$(printf '%s' "$chunk" | tr -cd "$limit_ptn")"
+  fi
+
+  if [ -n "$chunk" ]; then
+    if [ "$is_cooked" != true ]; then
+      if [ "$options_hideEchoBack" != true ]; then
+        write_tty "$chunk"
+      elif [ -n "$options_mask" ]; then
+        write_tty "$(replace_allchars "$chunk" "$options_mask")"
+      fi
+    fi
+    input="$input$chunk"
+  fi
+
+  if ( [ "$options_keyIn" != true ] && [ "$at_eol" = true ] ) || \
+    ( [ "$options_keyIn" = true ] && [ ${#input} -ge $req_size ] ); then break; fi
+done
+
+if [ "$is_cooked" != true ] && [ "$silent" != true ]; then write_tty "$(printf '%b' '\fNL')"; fi
+
+printf "'%s'" "$input"
+
+exit 0

z1-prototype/node_modules/readline-sync/package.json

@@ -0,0 +1,68 @@
+{
+  "_from": "readline-sync@^1.4.10",
+  "_id": "readline-sync@1.4.10",
+  "_inBundle": false,
+  "_integrity": "sha512-gNva8/6UAe8QYepIQH/jQ2qn91Qj0B9sYjMBBs3QOB8F2CXcKgLxQaJRP76sWVRQt+QU+8fAkCbCvjjMFu7Ycw==",
+  "_location": "/readline-sync",
+  "_phantomChildren": {},
+  "_requested": {
+    "type": "range",
+    "registry": true,
+    "raw": "readline-sync@^1.4.10",
+    "name": "readline-sync",
+    "escapedName": "readline-sync",
+    "rawSpec": "^1.4.10",
+    "saveSpec": null,
+    "fetchSpec": "^1.4.10"
+  },
+  "_requiredBy": [
+    "#USER",
+    "/"
+  ],
+  "_resolved": "https://registry.npmjs.org/readline-sync/-/readline-sync-1.4.10.tgz",
+  "_shasum": "41df7fbb4b6312d673011594145705bf56d8873b",
+  "_spec": "readline-sync@^1.4.10",
+  "_where": "/Users/jacob/Documents/University/Rok_3/Semestr_1/Analiza i projektowanie obiektowe/APO_automat/z1-prototype",
+  "author": {
+    "name": "anseki",
+    "url": "https://github.com/anseki"
+  },
+  "bugs": {
+    "url": "https://github.com/anseki/readline-sync/issues"
+  },
+  "bundleDependencies": false,
+  "deprecated": false,
+  "description": "Synchronous Readline for interactively running to have a conversation with the user via a console(TTY).",
+  "engines": {
+    "node": ">= 0.8.0"
+  },
+  "files": [
+    "lib/*.@(js|ps1|sh)",
+    "README-Deprecated.md"
+  ],
+  "homepage": "https://github.com/anseki/readline-sync",
+  "keywords": [
+    "readline",
+    "synchronous",
+    "interactive",
+    "prompt",
+    "question",
+    "password",
+    "cli",
+    "tty",
+    "command",
+    "repl",
+    "keyboard",
+    "wait",
+    "block"
+  ],
+  "license": "MIT",
+  "main": "./lib/readline-sync.js",
+  "name": "readline-sync",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/anseki/readline-sync.git"
+  },
+  "title": "readlineSync",
+  "version": "1.4.10"
+}

z1-prototype/package-lock.json

@@ -0,0 +1,13 @@
+{
+  "name": "vending-machine",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "readline-sync": {
+      "version": "1.4.10",
+      "resolved": "https://registry.npmjs.org/readline-sync/-/readline-sync-1.4.10.tgz",
+      "integrity": "sha512-gNva8/6UAe8QYepIQH/jQ2qn91Qj0B9sYjMBBs3QOB8F2CXcKgLxQaJRP76sWVRQt+QU+8fAkCbCvjjMFu7Ycw=="
+    }
+  }
+}

z1-prototype/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "vending-machine",
+  "version": "1.0.0",
+  "description": "",
+  "main": "menu.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "readline-sync": "^1.4.10"
+  }
+}

z1-prototype/product.js

@@ -0,0 +1,7 @@
+module.exports = class Product {
+    constructor(name, quantity, price) {
+        this.name = name;
+        this.quantity = quantity;
+        this.price = price;
+    }
+};

z1-prototype/products.json

@@ -0,0 +1,27 @@
+[
+    {
+        "name": "Snickers",
+        "quantity": 5,
+        "price": 2.5
+    },
+    {
+        "name": "Mars",
+        "quantity": 3,
+        "price": 2
+    },
+    {
+        "name": "Bounty",
+        "quantity": 7,
+        "price": 2.25
+    },
+    {
+        "name": "Pepsi",
+        "quantity": 10,
+        "price": 3
+    },
+    {
+        "name": "Mirinda",
+        "quantity": 8,
+        "price": 3
+    }
+]

z1-prototype/vendingMachine.js

@@ -0,0 +1,79 @@
+const Product = require('./product');
+
+module.exports = class VendingMachine {
+    constructor() {
+        this.id = Math.floor(Math.random() * 1000);
+        this.products = [];
+    }
+
+    addProduct(name, quantity, price) {
+        if (this.products[name]) {
+            this.products[name].quantity += quantity;
+        } else {
+            if (!price) {
+                console.error('Price not specified');
+                return 0;
+            }
+            this.products[name] = new Product(name, quantity, price);
+        }
+        return this.products[name];
+    }
+
+    buyProduct(id) {
+        this.products.forEach((product) => {
+            if (product.id == id) {
+                product.quantity--;
+            }
+        });
+    }
+
+    getProducts() {
+        return this.products;
+    }
+
+    getProductById(id) {
+        let product = null;
+        this.products.forEach((element) => {
+            if (element.id == id) {
+                product = element;
+            }
+        });
+        return product;
+    }
+
+    fillMachine() {
+        this.products = require('./products');
+        this.enumerateProducts();
+    }
+
+    enumerateProducts() {
+        let id = 1;
+        this.products.forEach((item) => (item.id = id++));
+    }
+
+    calculateChange(ammount) {
+        const availableCoins = [
+            0.01,
+            0.02,
+            0.05,
+            0.1,
+            0.2,
+            0.5,
+            1,
+            2,
+            5
+        ].reverse();
+        let change = [];
+        let sum = 0;
+        while (sum < ammount) {
+            for (let coin of availableCoins) {
+                if (sum + coin <= ammount) {
+                    change.push(coin);
+                    break;
+                }
+            }
+            sum = change.reduce((acc, curr) => acc + curr);
+        }
+        return change;
+    }
+};