Merge pull request #4 from IDevlin/gh-pruebas

day 10 exercise working

10_Day_Sets_and_Maps/10_day_starter/scripts/main.js

@@ -1,2 +1,118 @@
 console.log(countries)
-alert('Open the console and check if the countries has been loaded')
+//alert('Open the console and check if the countries has been loaded')
+
+//Exercises:Level 1
+/*const a = [4, 5, 8, 9]
+const b = [3, 4, 5, 7]
+const countries = ['Finland', 'Sweden', 'Norway']*/
+
+//1.create an empty set
+const set = new Set();
+//2.Create a set containing 0 to 10 using loop
+const set1 = new Set();
+for (let i = 0; i < 10; i++) {
+  set1.add(i); //Set(10) {0, 1, 2, 3, 4, …}
+}
+console.log(set1);
+//3. Remove an element from a set
+const arr = [2, 8, 10, 7];
+const set2 = new Set(arr);
+set2.delete(10); //Set(3) {2, 8, 7}
+
+console.log(set2);  // Set(3) {2, 8, 7}
+//4. Clear a set
+const arr1 = ['a', 'b', 'c', 'd'];
+const set3 = new Set(arr);
+set3.clear(); //Set(0) {size: 0}
+
+console.log(set3); 
+//5. Create a set of 5 string elements from array
+const fruits = ['apple', 'mango', 'kiwi', 'peach', 'orange']
+const setOfFruits = new Set(fruits);
+
+console.log(setOfFruits);
+//6. Create a map of countries and number of characters of a country
+const countries_ = ['Finland', 'Sweden', 'Denmark', 'Norway', 'IceLand'];
+const mapOfCountries = new Map();
+
+for (const country of countries_) {
+  mapOfCountries.set(country, country.length)
+}
+console.log(mapOfCountries)
+
+//Exercises:Level 2
+
+//1. Find a union b
+let a = [17, 54, 23, 98, 19]
+let b = [18, 22, 17, 20, 21, 98]
+let c = [...a, ...b]
+
+let C = new Set(c);
+
+console.log(C);
+//2. Find a intersection b
+let A = new Set(a);
+let B = new Set(b)
+
+let d = a.filter(num => B.has(num))
+let D = new Set(d)
+
+console.log(D)
+//3. Find a with b
+let e = a.filter(num => !B.has(num))
+let E = new Set(e)
+console.log(E)
+
+// Exercises:Level 3
+
+//1. How many languages are there in the countries object file.
+const languages = countries.map((element) => element.languages);
+console.log(languages)
+const unionLangs = languages.reduce((acc, cur) => [...acc, ...cur], [])
+const uniqLangs = new Set(unionLangs)
+console.log(uniqLangs.size) //112
+
+//2. Use the countries data to find the 10 most spoken languages:
+// Your output should look like this
+/*console.log(mostSpokenLanguages(countries, 10))
+[
+  { English: 91 },
+  { French: 45 },
+  { Arabic: 25 },
+  { Spanish: 24 },
+  { Russian: 9 },
+  { Portuguese: 9 },
+  { Dutch: 8 },
+  { German: 7 },
+  { Chinese: 5 },
+  { Swahili: 4 },
+  { Serbian: 4 }
+]
+
+// Your output should look like this
+console.log(mostSpokenLanguages(countries, 3))
+[
+{English:91},
+{French:45},
+{Arabic:25}
+]*/
+
+const langArr = [];
+for (const l of uniqLangs) {
+  const count =  unionLangs.filter((lang) => lang === l).length;
+  langArr.push({ [l] : count});
+}
+
+const sortedLang = langArr.sort((a, b) => {
+  return Object.values(b) - Object.values(a)
+});
+
+console.log(sortedLang)
+
+function mostSpokenLanguages(num) {
+  const langObject = sortedLang.filter((element) =>
+    sortedLang.indexOf(element) < num);
+  return langObject;
+}
+console.log(mostSpokenLanguages(10));
+