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victorprestonvictorpreston
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NodeJS Basic tutorial
0 parents  commit 248ec00

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‎.gitignore

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node_modules

‎0-console/0-console.js

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const displayMessage = (msg) => {
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console.log(msg);
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}
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module.exports = displayMessage;

‎0-console/0-main.js

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const displayMessage = require('./0-console');
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displayMessage("Hello NodeJS!");

‎1-stdin/1-stdin.js

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process.stdout.write("Welcome to Holberton School, what is your name?\n");
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if (process.stdin.isTTY){
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process.stdin.on('data', (data) =>{
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process.stdout.write(`Your name is: ${data.toString()}`);
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process.exit();
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});
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} else {
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process.stdin.on('data', (data) =>{
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process.stdout.write(`Your name is: ${data.toString()}`);
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process.exit();
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});
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process.on('exit', () =>{
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process.stdout.write('This important software is now closing\n');
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});
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};

‎2-read_file/2-main_0.js

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const countStudents = require('./2-read_file');
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countStudents("nope.csv");

‎2-read_file/2-main_1.js

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const countStudents = require('./2-read_file');
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countStudents("database.csv");

‎2-read_file/2-read_file.js

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const fs = require('fs');
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function countStudents(fileName){
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const students = {};
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const fields = {};
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let length = 0; //var, let, const
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try{
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const content = fs.readFileSync(fileName, 'utf-8');
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const lines = content.toString().split('\n');
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for (let i = 0; i < lines.length; i += 1){
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if (lines[i]){
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length += 1;
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const field = lines[i].toString().split(',');
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if (Object.prototype.hasOwnProperty.call(students, field[3])){
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students[field[3]].push(field[0]);
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}else {
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students[field[3]] = [field[0]];
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}
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if(Object.prototype.hasOwnProperty.call(fields, field[3])){
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fields[field[3]] += 1;
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} else {
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fields[field[3]] = 1;
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}
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}
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}
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const l = length - 1;
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console.log(`Number of students: ${l}`);
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for (const [key, value] of Object.entries(fields) ){
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if (key !== 'field'){
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console.log(`Number of students in ${key}: ${value}. List: ${students[key].join(', ')}`);
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}
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}
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} catch (error){
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throw new Error('Cannot load the database');
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}
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}
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module.exports = countStudents;

‎2-read_file/database.csv

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firstname,lastname,age,field
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Johann,Kerbrou,30,CS
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Guillaume,Salou,30,SWE
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Arielle,Salou,20,CS
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Jonathan,Benou,30,CS
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Emmanuel,Turlou,40,CS
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Guillaume,Plessous,35,CS
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Joseph,Crisou,34,SWE
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Paul,Schneider,60,SWE
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Tommy,Schoul,32,SWE
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Katie,Shirou,21,CS

‎3-read_file_async/3-main_0.js

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const countStudents = require('./3-read_file_async');
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countStudents("nope.csv")
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.then(() => {
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console.log("Done!");
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})
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.catch((error) => {
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console.log(error);
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});

‎3-read_file_async/3-main_1.js

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const countStudents = require('./3-read_file_async');
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countStudents("database.csv")
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.then(() => {
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console.log("Done!");
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})
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.catch((error) => {
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console.log(error);
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});
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console.log("After!");

‎3-read_file_async/3-read_file_async.js

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const {readFile} = require('fs');
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function countStudents(fileName){
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const students = {};
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const fields = {};
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let length = 0; //var, let, const
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return new Promise((resolve, reject) => {
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readFile(fileName, (error, data) => {
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if (error){
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reject(Error('Cannot load the database'));
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} else{
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const lines = data.toString().split('\n');
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for (let i = 0; i < lines.length; i += 1){
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if (lines[i]){
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length += 1;
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const field = lines[i].toString().split(',');
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if (Object.prototype.hasOwnProperty.call(students, field[3])){
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students[field[3]].push(field[0]);
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}else {
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students[field[3]] = [field[0]];
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}
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if(Object.prototype.hasOwnProperty.call(fields, field[3])){
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fields[field[3]] += 1;
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} else {
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fields[field[3]] = 1;
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}
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}
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}
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const l = length - 1;
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console.log(`Number of students: ${l}`);
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for (const [key, value] of Object.entries(fields) ){
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if (key !== 'field'){
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console.log(`Number of students in ${key}: ${value}. List: ${students[key].join(', ')}`);
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}
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}
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resolve(data);
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}
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})
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});
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// try{
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// const content = fs.readFileSync(fileName, 'utf-8');
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// const lines = content.toString().split('\n');
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// for (let i = 0; i < lines.length; i += 1){
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// if (lines[i]){
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// length += 1;
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// const field = lines[i].toString().split(',');
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// if (Object.prototype.hasOwnProperty.call(students, field[3])){
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// students[field[3]].push(field[0]);
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// }else {
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// students[field[3]] = [field[0]];
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// }
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// if(Object.prototype.hasOwnProperty.call(fields, field[3])){
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// fields[field[3]] += 1;
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// } else {
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// fields[field[3]] = 1;
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// }
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// }
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// }
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// const l = length - 1;
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// console.log(`Number of students: ${l}`);
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// for (const [key, value] of Object.entries(fields) ){
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// if (key !== 'field'){
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// console.log(`Number of students in ${key}: ${value}. List: ${students[key].join(', ')}`);
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// }
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// }
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// } catch (error){
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// throw new Error('Cannot load the database');
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// }
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}
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module.exports = countStudents;

‎3-read_file_async/database.csv

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firstname,lastname,age,field
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Johann,Kerbrou,30,CS
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Guillaume,Salou,30,SWE
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Arielle,Salou,20,CS
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Jonathan,Benou,30,CS
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Emmanuel,Turlou,40,CS
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Guillaume,Plessous,35,CS
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Joseph,Crisou,34,SWE
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Paul,Schneider,60,SWE
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Tommy,Schoul,32,SWE
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Katie,Shirou,21,CS

‎4-http/4-http.js

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const http = require ('http');
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const port = 1245;
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const host = '127.0.0.1';
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const app = http.createServer((req, res) => {
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res.statusCode = 200;
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res.setHeader('Content-Type', 'text/plain');
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res.end('Hello Holberton School!');
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});
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app.listen(port, host, () => {});
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module.exports = app;

‎5-http/5-http.js

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const http = require('http');
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const {readFile} = require('fs');
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const port = 1245;
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const hostname = '127.0.0.1'
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function countStudents(fileName){
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const students = {};
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const fields = {};
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let length = 0; //var, let, const
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return new Promise((resolve, reject) => {
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readFile(fileName, (err, data)=>{
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if (err){
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reject(err);
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} else {
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let output = '';
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const lines = data.toString().split('\n');
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for (let i = 0; i < lines.length; i += 1){
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if(lines[i]){
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length += 1;
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const field = lines[i].toString().split(',');
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if (Object.prototype.hasOwnProperty.call(students, field[3])){
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students[field[3]].push(field[0]);
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} else {
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students[field[3]] = [field[0]];
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}
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if (Object.prototype.hasOwnProperty.call(fields, field[3])){
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fields[field[3]] += 1;
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} else {
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fields[field[3]] = 1;
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}
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}
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}
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const l = length -1;
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output += `Number of students: ${l}\n`;
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for (const [key, value] of Object.entries(fields)){
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if (key !== 'field'){
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output += `Number of students in ${key}: ${value}.`;
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output += ` List: ${students[key].join(', ')}\n`;
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}
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}
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resolve(output);
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}
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});
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});
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}
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const app = http.createServer((req, res) => {
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res.statusCode = 200;
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res.setHeader('Content-Type', 'text/plain');
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if (req.url === '/'){
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res.write('Hello Holberton School!');
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res.end();
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}
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if(req.url === '/students'){
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res.write('This is the list of our students\n');
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countStudents(process.argv[2]).then((output) => {
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const outString = output.slice(0, -1);
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res.end(outString);
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}).catch(() => {
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res.statusCode = 404;
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res.end('Cannot load the database');
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});
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}
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});
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app.listen(port, hostname, () => {
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console.log(`Server running at http://${hostname}:${port}`);
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});
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module.exports = countStudents;

‎5-http/database.csv

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firstname,lastname,age,field
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Johann,Kerbrou,30,CS
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Guillaume,Salou,30,SWE
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Arielle,Salou,20,CS
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Jonathan,Benou,30,CS
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Emmanuel,Turlou,40,CS
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Guillaume,Plessous,35,CS
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Joseph,Crisou,34,SWE
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Paul,Schneider,60,SWE
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Tommy,Schoul,32,SWE
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Katie,Shirou,21,CS

‎6-http_express/6-http_express.js

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const express = require('express');
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const app = express();
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const port = 1245;
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app.get('/', (request, response) => {
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response.send('Hello Holberton School!');
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});
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app.listen(port, () => {
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console.log(`Server running at http://localhost:${port}`);
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})
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module.exports = app;

‎7-http_express/7-http_express.js

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const express = require('express');
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const {readFile} = require('fs');
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const port = 1245;
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const app = express();
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const hostname = '127.0.0.1';
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function countStudents(fileName){
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const students = {};
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const fields = {};
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let length = 0; //var, let, const
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return new Promise((resolve, reject) => {
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readFile(fileName, (err, data)=>{
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if (err){
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reject(err);
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} else {
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let output = '';
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const lines = data.toString().split('\n');
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for (let i = 0; i < lines.length; i += 1){
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if(lines[i]){
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length += 1;
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const field = lines[i].toString().split(',');
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if (Object.prototype.hasOwnProperty.call(students, field[3])){
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students[field[3]].push(field[0]);
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} else {
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students[field[3]] = [field[0]];
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}
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if (Object.prototype.hasOwnProperty.call(fields, field[3])){
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fields[field[3]] += 1;
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} else {
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fields[field[3]] = 1;
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}
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}
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}
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const l = length -1;
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output += `Number of students: ${l}\n`;
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for (const [key, value] of Object.entries(fields)){
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if (key !== 'field'){
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output += `Number of students in ${key}: ${value}.`;
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output += ` List: ${students[key].join(', ')}\n`;
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}
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}
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resolve(output);
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}
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});
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});
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}
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app.get('/', (req, res) => {
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res.send('Hello Holberton School!');
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});
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app.get('/students', (req, res) => {
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countStudents(process.argv[2].toString()).then((output) =>{
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res.send(['This is the list of our students', output].join('\n'));
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}).catch(()=>{
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res.send('This is the list of our students\nCannot load the database');
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});
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});
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app.listen(port, hostname, () => {
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console.log(`Server running at http://${hostname}:${port}`);
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});
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module.exports = countStudents;

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