added first correction

travail-pratique-3/script.js

@@ -0,0 +1,224 @@
+document.getElementById("main-title").innerText = "Travail Pratique III";
+
+
+const cities = [
+    {"name": "Montreal", "population": 1762949, "country": "Canada"},
+    {"name": "Toronto", "population": 2794356, "country": "Canada"},
+    {"name": "Vancouver", "population": 662248, "country": "Canada"},
+
+
+    {"name": "Bogota", "population": 8034649, "country": "Colombie"},
+    {"name": "Medellin", "population": 8034649, "country": "Colombie"},
+
+
+    {"name": "Alger", "population": 3154792, "country": "Algerie"},
+    {"name": "Oran", "population": 803329, "country": "Algerie"},
+
+    {"name": "Mexico", "population": 9209944, "country": "Mexique"}
+
+];
+
+const persons = [
+    {"name": "Maurice Vachon", "city": "Montreal"},
+    {"name": "Jane Munro", "city": "Vancouver"},
+    {"name": "Eckhart Tolle", "city": "Vancouver"},
+    {"name": "Ingrid Betancourt", "city": "Bogota"},
+    {"name": "DJ Pope", "city": "Medellin"},
+    {"name": "Djaffar Bensetti", "city": "Oran"}
+
+];
+
+function isNumber(x) {
+    return x !== "" && !isNaN(x);
+}
+
+function isPositiveInteger(text) {
+    return isNumber(text) && parseInt(text) >= 0;
+}
+
+function isStrictlyPositiveInteger(text){
+    return isPositiveInteger(text) && parseInt(text) !== 0;
+}
+
+function sumUpTo(n){
+    let sum = 0;
+    for(let i = 0; i <= n; i ++){
+        sum = sum + i;
+    }
+    return sum;
+}
+
+function sumUpToByStep(step, limit){
+    let sum = 0;
+    for(let i = 0; i <= limit; i = i + step){
+        sum = sum + i;
+    }
+    return sum;
+
+}
+
+function exo2Message(userInput){
+    if(!isPositiveInteger(userInput)){
+        return "Entré invalide";
+    }
+    return sumUpTo(parseInt(userInput));
+}
+
+function exo2(){
+    const userInput = document.getElementById("input-1").value;
+    document.getElementById("result-box-1").innerText = exo2Message(userInput);
+}
+
+
+document.getElementById("button-1").onclick = exo2;
+
+function exo3Message(stepUserInput, limitUserInput){
+    if(!isStrictlyPositiveInteger(stepUserInput)){
+        return "Entré invalide";
+    }
+    if(!isStrictlyPositiveInteger(limitUserInput)){
+        return "Entré invalide";
+    }
+    return sumUpToByStep(parseInt(stepUserInput), parseInt(limitUserInput));
+}
+
+function exo3(){
+    const stepUserInput = document.getElementById("input-1").value;
+    const limitUserInput = document.getElementById("input-2").value;
+    document.getElementById("result-box-2").innerText = exo3Message(stepUserInput, limitUserInput);
+}
+
+
+document.getElementById("button-2").onclick = exo3;
+
+
+function exo4Message(city) {
+    return getCityByName(city)?.country??"ville non trouvée";
+}
+
+function exo4(){
+    const userInput = document.getElementById("input-3").value;
+    document.getElementById("result-box-3").innerText = exo4Message(userInput);
+}
+
+
+document.getElementById("button-3").onclick = exo4;
+
+
+
+function findNumberOfCitiesInCountry(countryName) {
+    let n = 0;
+    for(let city of cities){
+        if(city.country === countryName){
+            n = n + 1;
+        }
+    }
+    return n;
+}
+
+function exo6(){
+    const userInput = document.getElementById("input-1").value;
+    document.getElementById("result-box-1").innerText = findNumberOfCitiesInCountry(userInput);
+}
+
+
+document.getElementById("button-5").onclick = exo6;
+
+
+function findPopulationOfCitiesInCountry(countryName) {
+    let population = 0;
+    for(let city of cities){
+        if(city.country === countryName){
+            population = population + city.population;
+        }
+    }
+    return population;
+}
+
+function exo7(){
+    const userInput = document.getElementById("input-2").value;
+    document.getElementById("result-box-2").innerText = findPopulationOfCitiesInCountry(userInput);
+}
+
+
+document.getElementById("button-6").onclick = exo7;
+
+function getCitiesInCountry(country) {
+    const ret = [];
+    for(const city of cities){
+        if(city.country == country){
+            ret.push(city);
+        }
+
+    }
+    return ret;
+}
+
+function getLargestCity(cities){
+    let largestCity;
+    let largestCityPopulation = -1;
+    for(const city of cities){
+        if(city.population > largestCityPopulation){
+            largestCity = city;
+            largestCityPopulation = city.population;
+        }
+    }
+    return largestCity;
+
+}
+
+function findLargestCitiesInCountry(country){
+    const citiesInCountry = getCitiesInCountry(country);
+    if(citiesInCountry.length === 0){
+        return "aucune ville trouvée";
+    }
+    const largestCity = getLargestCity(citiesInCountry);
+    return largestCity.name;
+
+}
+
+function exo8(){
+    const userInput = document.getElementById("input-3").value;
+    document.getElementById("result-box-3").innerText = findLargestCitiesInCountry(userInput);
+}
+
+
+document.getElementById("button-7").onclick = exo8;
+
+
+function getPersonByName(personName) {
+    for(const person of persons){
+        if(personName === person.name){
+            return person;
+        }
+    }
+}
+
+function getCityByName(cityName) {
+    for(const city of cities){
+        if(city.name === cityName){
+            return city;
+        }
+    }
+    return {};
+}
+
+function findCountryOfOrigin(personName){
+    const person = getPersonByName(personName);
+    if(!person){
+        return "aucune personne trouvée";
+    }
+    return getCityByName(person.city).country
+}
+
+
+function exo9(){
+    const userInput = document.getElementById("input-4").value;
+    document.getElementById("result-box-4").innerText = findCountryOfOrigin(userInput);
+}
+
+
+document.getElementById("button-8").onclick = exo9;
+
+
+