Solved lab with bonuses!

src/presidents.js

@@ -419,47 +419,67 @@ const presidents = [
 
 
 // Iteration 1 | Names of All Presidents - `map()`
-function getNames(presidentsArr) {}
-
-
+function getNames(presidentsArr) {
+  const presidentNames = presidentsArr.map(president => president.name);
+  return presidentNames;
+}
 
 
 // Iteration 2 | Democratic Presidents - `filter()`
-function getDemocraticPresidents(presidentsArr) {}
-
-
+function getDemocraticPresidents(presidentsArr) {
+  const filteredDemocraticPresidents = presidentsArr.filter(president => president.party === "Democratic");
+  return filteredDemocraticPresidents;
+}
 
 
 // Iteration 3 | Count Years in Office - reduce()
-function  countYearsInOffice(presidentsArr) {}
-
-
+function  countYearsInOffice(presidentsArr) {
+  const countYears = presidentsArr.reduce((aux, president) => {
+    if (president.leftOffice !== null) {
+      return aux + (president.leftOffice - president.tookOffice);
+    } else {
+      return aux;
+    }
+  }, 0);
+  return countYears;
+}
 
 
 // Iteration 4 | Sort Presidents by Birth Year - `sort()`
-function sortPresidentsByBirthYear(presidentsArr) {}
-
-
+function sortPresidentsByBirthYear(presidentsArr) {
+  return presidentsArr.sort((presidentA, presidentB) => {
+    return presidentA.birthYear - presidentB.birthYear;
+  });
+}
 
 
 // Bonus: Iteration 5 | Age at Inauguration - `map()`
-function getAgeAtInauguration(presidentsArr) {}
-
-
+function getAgeAtInauguration(presidentsArr) {
+  const presidents = presidentsArr.map((president) => {
+    return {...president, ageAtInauguration : president.tookOffice - president.birthYear};
+  });
+  return presidents;
+}
 
 
 // Bonus: Iteration 6 | Presidents Born After - `filter()`
-function getPresidentsBornAfter(presidentsArr, year) {}
-
-
-
+function getPresidentsBornAfter(presidentsArr, year) {
+  const presidentsBornAfter = presidentsArr.filter(president => president.birthYear > year);
+  return presidentsBornAfter;
+}
 
 // Bonus: Iteration 7 | Count Republican Presidents
-function countRepublicanPresidents(presidentsArr) {}
-
-
+function countRepublicanPresidents(presidentsArr) {
+  const republicanPresidents = presidentsArr.reduce((aux, president) => {
+    if (president.party === "Republican") aux++;
+    return aux;
+  }, 0);
+  return republicanPresidents;
+}
 
 
 // Bonus: Iteration 8 | Sort Presidents by Name - `sort()`
-function sortPresidentsByName(presidentsArr) {}
+function sortPresidentsByName(presidentsArr) {
+  return presidentsArr.sort((presidentA, presidentB) => presidentA.name.localeCompare(presidentB.name));
+}
 

tests/bonus.specs.js

@@ -1,4 +1,4 @@
-xdescribe("BONUS", () => {
+describe("BONUS", () => {
   // Bonus: Iteration 5
   describe("Bonus: Iteration 5 | Age at Inauguration", () => {
     it("should take 1 argument (presidents)", () => {