feat: Sum of several arrays

src/code-challenges/code-challenges-003-010.js

@@ -12,3 +12,37 @@ function simpleClockAngle(number) {
   // gives us the number of degrees for one minute
   return 6 * number;
 }
+
+/**
+ * Q004: Sum of several arrays
+ * Problem
+ * You will be given an array of several arrays that each contain integers and your goal is to write a function that will sum up all the numbers in all the arrays.
+ * For example, if the input is [[3, 2], [1], [4, 12]] then your program should output 22 because 3 + 2 + 1 + 4 + 12 = 22. Solve without and with reduce.
+ */
+
+// Normal
+function multiDimensionalSumOfSeveralArrayVariationNormal(array) {
+  // Store our final answer
+  let sum = 0;
+  // Loop through entire array.
+  for (let i = 0; i < array.length; i++) {
+    // Loop through each inner array.
+    for (let j = 0; j < array[i].length; j++) {
+      sum += array[i][j];
+    }
+  }
+
+  return sum;
+}
+
+multiDimensionalSumOfSeveralArrayVariationNormal([[3, 2], [1], [4, 12]]);
+// reduce
+
+function multiDimensionalSumOfSeveralArrayVariationReduce(array) {
+  return array.reduce((t, e) => t.concat(e)).reduce((t, e) => t + e);
+}
+multiDimensionalSumOfSeveralArrayVariationReduce([[3, 2], [1], [4, 12]]);
+
+/**
+ * Q005: Test divisors of three
+ */