advanced array methods homework

index.js

@@ -26,22 +26,24 @@ Use getFinals to do the following:
 💡 HINT - you should be looking at the stage key inside of the objects
 */
 
-function getFinals(/* code here */) {
-    /* code here */
+function getFinals(array) {
+    const allFinals = array.filter(function(item){
+        return item.Stage === 'Final';
+    })
+    return allFinals;
  }
-
-
+// console.log(getFinals(fifaData));
 
 /* 🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀 Task 3: 🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀
 Use the higher-order function called getYears to do the following: 
 1. Receive an array as the first parameter that will take fifaData as an argument
 2. Receive a callback function as the second parameter that will take getFinals from task 2 as an argument
 3. Return an array called years containing all of the years in the getFinals data set*/
 
-function getYears(/* code here */) {
-    /* code here */
-}
+function getYears(array, getFinalsCB) {
+    return getFinalsCB(array).map(item => item.Year);
 
+}
 
 
 /* 🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀 Task 4: 🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀
@@ -52,8 +54,9 @@ Use the higher-order function getWinners to do the following:
 💡 HINT: Don't worry about ties for now (Please see the README file for info on ties for a stretch goal.)
 4. Returns the names of all winning countries in an array called `winners` */ 
 
-function getWinners(/* code here */) {
-    /* code here */
+function getWinners(array, getFinalsCB) {
+    return getFinalsCB(array).map(item => item['Home Team Goals'] > item['Away Team Goals'] ? 
+    item ['Home Team Name'] : item ['Away Team Name']);
 }
 
 
@@ -69,8 +72,12 @@ Use the higher-order function getWinnersByYear to do the following:
 💡 HINT: the strings returned need to exactly match the string in step 4.
  */
 
-function getWinnersByYear(/* code here */) {
-    /* code here */
+function getWinnersByYear(array, getFinalsCB, getYearsCB, getWinnersCB) {
+  const winners = getWinnersCB(array, getFinals)
+  const years = getYearsCB(array, getFinals)
+
+
+    return winners.map((item, index) =>`In ${years[index]}, ${item} won the world cup!`);
 }
 
 
@@ -88,8 +95,11 @@ Use the higher order function getAverageGoals to do the following:
 
 */
 
-function getAverageGoals(/* code here */) {
-    /* code here */
+function getAverageGoals(array) {
+   const avgHomeGoals = array.reduce(function(accumulator, item){
+       return accumulator + item['Home Team Goals'] + item ['Away Team Goals'];
+   }, 0)
+   return (avgHomeGoals / array.length).toFixed(2);
  }