From 59bdabc0128e7e605c75597197cd69d01409910e Mon Sep 17 00:00:00 2001 From: Tomas Krejci Date: Mon, 8 Jun 2026 20:06:24 +0200 Subject: [PATCH] Add third lecture Node examples --- Lecture_1/01-select.sql | 3 + lecture_2/01-definicni-prikazy.sql | 10 + lecture_2/02-manipulacni-prikazy.sql | 2 + lecture_3/hello-world-node/.prettierrc.json | 6 + lecture_3/hello-world-node/01-hello-world.js | 1 + lecture_3/hello-world-node/arithmetic-mean.js | 15 + lecture_3/hello-world-node/eslint.config.js | 23 + lecture_3/hello-world-node/package-lock.json | 927 ++++++++++++++++++ lecture_3/hello-world-node/package.json | 21 + lecture_3/hello-world-node/perfect-number.js | 85 ++ lecture_3/hello-world-node/prime.js | 20 + lecture_3/hello-world-node/suda.js | 16 + lecture_3/hello-world-node/sum.js | 7 + 13 files changed, 1136 insertions(+) create mode 100644 lecture_3/hello-world-node/.prettierrc.json create mode 100644 lecture_3/hello-world-node/01-hello-world.js create mode 100644 lecture_3/hello-world-node/arithmetic-mean.js create mode 100644 lecture_3/hello-world-node/eslint.config.js create mode 100644 lecture_3/hello-world-node/package-lock.json create mode 100644 lecture_3/hello-world-node/package.json create mode 100644 lecture_3/hello-world-node/perfect-number.js create mode 100644 lecture_3/hello-world-node/prime.js create mode 100644 lecture_3/hello-world-node/suda.js create mode 100644 lecture_3/hello-world-node/sum.js diff --git a/Lecture_1/01-select.sql b/Lecture_1/01-select.sql index 726ad2e..d103e81 100644 --- a/Lecture_1/01-select.sql +++ b/Lecture_1/01-select.sql @@ -78,4 +78,7 @@ SELECT * FROM accounts JOIN cards ON accounts.id = cards.account_id; SELECT * FROM accounts LEFT JOIN cards ON accounts.id = cards.account_id; +-- Filter accounts with a balance greater than 10. +SELECT * FROM accounts WHERE balance > 10; + -- PostgreSQL console command for describing the accounts table: \d accounts diff --git a/lecture_2/01-definicni-prikazy.sql b/lecture_2/01-definicni-prikazy.sql index d2f2471..8e8d829 100644 --- a/lecture_2/01-definicni-prikazy.sql +++ b/lecture_2/01-definicni-prikazy.sql @@ -40,3 +40,13 @@ CREATE TABLE animals_keepers ( ); -- Change an existing table structure with ALTER TABLE. +ALTER TABLE keepers ADD COLUMN role VARCHAR(255) DEFAULT 'caretaker'; + +ALTER TABLE keepers RENAME COLUMN role TO position; + +ALTER TABLE keepers ALTER COLUMN position TYPE TEXT; + +-- This statement intentionally fails because the text default cannot be converted to INT. +ALTER TABLE keepers ALTER COLUMN position TYPE INT; + +ALTER TABLE keepers DROP COLUMN position; diff --git a/lecture_2/02-manipulacni-prikazy.sql b/lecture_2/02-manipulacni-prikazy.sql index 79fd05b..f1d5102 100644 --- a/lecture_2/02-manipulacni-prikazy.sql +++ b/lecture_2/02-manipulacni-prikazy.sql @@ -62,3 +62,5 @@ INSERT INTO VALUES ('vlk', NOW(), 'pozor kouĊĦe'); SELECT * FROM animals; + +SELECT * FROM animals_keepers; diff --git a/lecture_3/hello-world-node/.prettierrc.json b/lecture_3/hello-world-node/.prettierrc.json new file mode 100644 index 0000000..9f34c6b --- /dev/null +++ b/lecture_3/hello-world-node/.prettierrc.json @@ -0,0 +1,6 @@ +{ + "endOfLine": "lf", + "useTabs": true, + "printWidth": 120, + "tabWidth": 4 +} diff --git a/lecture_3/hello-world-node/01-hello-world.js b/lecture_3/hello-world-node/01-hello-world.js new file mode 100644 index 0000000..e35f5ff --- /dev/null +++ b/lecture_3/hello-world-node/01-hello-world.js @@ -0,0 +1 @@ +console.log("start"); diff --git a/lecture_3/hello-world-node/arithmetic-mean.js b/lecture_3/hello-world-node/arithmetic-mean.js new file mode 100644 index 0000000..1d7e966 --- /dev/null +++ b/lecture_3/hello-world-node/arithmetic-mean.js @@ -0,0 +1,15 @@ +import prompt from "prompt-sync"; +const promptSync = prompt(); + +// Function to calculate the arithmetic mean of two numbers +function calculateAverage(a, b) { + return (a + b) / 2; +} + +const number1 = Number(promptSync("Enter the first number: ")); +const number2 = Number(promptSync("Enter the second number: ")); + +// Calculate and display the result +const average = calculateAverage(number1, number2); + +console.log(`The arithmetic mean of ${number1} and ${number2} is ${average}.`); diff --git a/lecture_3/hello-world-node/eslint.config.js b/lecture_3/hello-world-node/eslint.config.js new file mode 100644 index 0000000..28cba4d --- /dev/null +++ b/lecture_3/hello-world-node/eslint.config.js @@ -0,0 +1,23 @@ +import js from "@eslint/js"; +import globals from "globals"; +import json from "@eslint/json"; +import { defineConfig } from "eslint/config"; + +export default defineConfig([ + { + ignores: ["node_modules/**", "package-lock.json"], + }, + { + files: ["**/*.{js,mjs,cjs}"], + plugins: { js }, + extends: ["js/recommended"], + languageOptions: { globals: globals.node, ecmaVersion: 2025 }, + rules: { + indent: ["error", "tab"], + "linebreak-style": ["error", "unix"], + quotes: ["error", "double"], + semi: ["error", "always"], + }, + }, + { files: ["**/*.json"], plugins: { json }, language: "json/json", extends: ["json/recommended"] }, +]); diff --git a/lecture_3/hello-world-node/package-lock.json b/lecture_3/hello-world-node/package-lock.json new file mode 100644 index 0000000..ddb4378 --- /dev/null +++ b/lecture_3/hello-world-node/package-lock.json @@ -0,0 +1,927 @@ +{ + "name": "hello-world-node", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "hello-world-node", + "version": "1.0.0", + "dependencies": { + "prompt-sync": "^4.2.0" + }, + "devDependencies": { + "@eslint/js": "^10.0.1", + "@eslint/json": "^1.2.0", + "eslint": "^10.0.0", + "globals": "^17.4.0", + "prettier": "^3.0.0" + } + }, + "node_modules/@eslint-community/eslint-utils": { + "version": "4.9.1", + "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.1.tgz", + "integrity": 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"prettier --write .", + "check": "npm run lint && prettier --check ." + }, + "dependencies": { + "prompt-sync": "^4.2.0" + }, + "devDependencies": { + "@eslint/js": "^10.0.1", + "@eslint/json": "^1.2.0", + "eslint": "^10.0.0", + "globals": "^17.4.0", + "prettier": "^3.0.0" + } +} diff --git a/lecture_3/hello-world-node/perfect-number.js b/lecture_3/hello-world-node/perfect-number.js new file mode 100644 index 0000000..cedca35 --- /dev/null +++ b/lecture_3/hello-world-node/perfect-number.js @@ -0,0 +1,85 @@ +// Function to check if a number is perfect +function isPerfect(number) { + if (number <= 1) { + return false; + } + + let sum = 1; + + for (let i = 2; i <= Math.sqrt(number); i++) { + if (number % i === 0) { + sum += i; + + if (i !== number / i) { + sum += number / i; + } + } + } + + return sum === number; +} + +// Slow version: checks every number +function generatePerfectNumbersSlow(countLimit) { + let count = 0; + let number = 1; + + while (count < countLimit) { + if (isPerfect(number)) { + console.log(number); + count++; + } + + number++; + } +} + +// Function to check if a number is prime +function isPrime(number) { + if (number <= 1) { + return false; + } + + for (let i = 2; i <= Math.sqrt(number); i++) { + if (number % i === 0) { + return false; + } + } + + return true; +} + +// Fast version: uses Mersenne primes +function generatePerfectNumbersFast(countLimit) { + let count = 0; + let p = 2; + + while (count < countLimit) { + const mersenneNumber = Math.pow(2, p) - 1; + + if (isPrime(mersenneNumber)) { + const perfectNumber = Math.pow(2, p - 1) * mersenneNumber; + console.log(perfectNumber); + count++; + } + + p++; + } +} + +// Keep the slow demonstration small enough to finish in a reasonable time. +const countLimit = 4; + +console.log("Slow version:"); +console.time("Slow version time"); +generatePerfectNumbersSlow(countLimit); +console.timeEnd("Slow version time"); + +console.log("--------------------"); + +console.log("Fast version:"); +console.time("Fast version time"); +generatePerfectNumbersFast(countLimit); +console.timeEnd("Fast version time"); + +console.log("end"); diff --git a/lecture_3/hello-world-node/prime.js b/lecture_3/hello-world-node/prime.js new file mode 100644 index 0000000..58b5081 --- /dev/null +++ b/lecture_3/hello-world-node/prime.js @@ -0,0 +1,20 @@ +import prompt from "prompt-sync"; +const promptSync = prompt(); + +// Function to check if a number is prime +function isPrime(number) { + if (number <= 1) { + return false; + } + for (let i = 2; i <= Math.sqrt(number); i++) { + if (number % i === 0) { + return false; + } + } + return true; +} + +const number = Number(promptSync("Enter the number: ")); + +// Calculate and display the result +console.log(`Is ${number} prime? ${isPrime(number)}.`); diff --git a/lecture_3/hello-world-node/suda.js b/lecture_3/hello-world-node/suda.js new file mode 100644 index 0000000..8bcc6aa --- /dev/null +++ b/lecture_3/hello-world-node/suda.js @@ -0,0 +1,16 @@ +import prompt from "prompt-sync"; +const promptSync = prompt(); + +const number1 = Number(promptSync("Enter the first number: ")); +const number2 = Number(promptSync("Enter the second number: ")); + +const start = Math.min(number1, number2); +const end = Math.max(number1, number2); + +console.log(`Even numbers between ${start} and ${end}:`); + +for (let i = start + 1; i <= end; i++) { + if (i % 2 === 0) { + console.log(i); + } +} diff --git a/lecture_3/hello-world-node/sum.js b/lecture_3/hello-world-node/sum.js new file mode 100644 index 0000000..5330a32 --- /dev/null +++ b/lecture_3/hello-world-node/sum.js @@ -0,0 +1,7 @@ +import prompt from "prompt-sync"; +const promptSync = prompt(); + +const number1 = Number(promptSync("Enter the first number: ")); +const number2 = Number(promptSync("Enter the second number: ")); + +console.log(`Sum of ${number1} and ${number2} is ${number1 + number2}.`);