Barcelona | OCT25 | Tatiana Kuzmina | Sprint 1 | Module-Data-Groups

Sprint-1/fix/median.js

@@ -6,9 +6,22 @@
 // or 'list' has mixed values (the function is expected to sort only numbers).
 
 function calculateMedian(list) {
-  const middleIndex = Math.floor(list.length / 2);
-  const median = list.splice(middleIndex, 1)[0];
-  return median;
+  if (!Array.isArray(list)) {
+    return null;
+  }
+  const numbersOnly = list.filter((item) => typeof item === "number");
+  if (numbersOnly.length === 0) {
+    return null;
+  }
+  const sortedNumbers = [...numbersOnly].sort((a, b) => a - b);
+
+  const len = sortedNumbers.length;
+  const middleIndex = Math.floor(len / 2);
+  if (len % 2 !== 0) {
+    return sortedNumbers[middleIndex];
+  } else {
+    return (sortedNumbers[middleIndex - 1] + sortedNumbers[middleIndex]) / 2;
+  }
 }
 
 module.exports = calculateMedian;

Sprint-1/implement/dedupe.js

@@ -1 +1,8 @@
-function dedupe() {}
+function dedupe(list) {
+  if (!Array.isArray(list)) {
+    return list;
+  }
+  return [...new Set(list)];
+}
+
+module.exports = dedupe;

Sprint-1/implement/max.js

@@ -1,4 +1,9 @@
 function findMax(elements) {
+  const numbersOnly = elements.filter((item) => typeof item === "number");
+  if (numbersOnly.length === 0) {
+    return -Infinity;
+  }
+  return Math.max(...numbersOnly);
 }
 
 module.exports = findMax;

Sprint-1/implement/sum.js

@@ -1,4 +1,6 @@
-function sum(elements) {
+function sum(numbers) {
+  const numbersOnly = numbers.filter((item) => typeof item === "number");
+  return numbersOnly.reduce((total, current) => total + current, 0);
 }
 
 module.exports = sum;

Sprint-1/refactor/includes.js

@@ -1,13 +1,12 @@
 // Refactor the implementation of includes to use a for...of loop
 
 function includes(list, target) {
-  for (let index = 0; index < list.length; index++) {
-    const element = list[index];
+  for (const element of list) {
     if (element === target) {
       return true;
     }
   }
   return false;
 }
 
-module.exports = includes;
+module.exports = includes;

Sprint-1/stretch/aoc-2018-day1/solution.js

@@ -0,0 +1,7 @@
+function calibrate(input) {
+  return input.reduce((total, change) => {
+    return total + parseInt(change, 10);
+  }, 0);
+}
+
+module.exports = calibrate;