[EX-11.6/st-compl] finding-average-value

Finding "average" of num's in arr. Only by reduce().

Worth noting:
  - alternative solutions (best practice).

FS-dev: B-3 / JS basic

Author: matowdev

full-stack-dev/3-js-basic/11-arrays-iterations/11-6-ex-finding-average-value/index.js

@@ -0,0 +1,19 @@
+// Нужно найти "среднее значение" чисел произвольного массива, с помощью reduce().
+
+const arr = [1, 4, 4, 10];
+
+const meanValue = arr.reduce((acc, num) => acc + num / arr.length, 0);
+console.log(meanValue); // 4.75
+
+// ?? альтернативное решение
+const newMeanValue = arr.reduce((acc, num, index, array) => {
+  acc += num;
+
+  if (index === array.length - 1) {
+    return acc / array.length;
+  }
+
+  return acc;
+}, 0);
+
+console.log(newMeanValue); // 4.75