week 1 done

week-1/refactor/find.js

@@ -1,10 +1,10 @@
 // Refactor the implementation of find to use a for...of loop
 
 function find(list, target) {
-  for (let index = 0; index < list.length; index++) {
-    const element = list[index];
+  for (let x of list) {
+    const element = x;
     if (element === target) {
-      return index;
+      return list.indexOf(x);
     }
   }
   return -1;

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

@@ -0,0 +1,19 @@
+const fs = require("fs");
+const txtDoc = fs.readFileSync("./input.txt", "utf8");
+const txtList = txtDoc.split("\n");
+const numList = txtList.map(Number);
+
+function calculateFrequency(list) {
+  let sum = 0;
+
+  for (let x of list) {
+    if (!isNaN(x)) {
+      sum += x;
+    }
+  }
+  return sum;
+}
+
+console.log(calculateFrequency(numList));
+
+module.exports = calculateFrequency;

week-1/stretch/aoc-2018-day1/solution.test.js

@@ -0,0 +1,34 @@
+const calculateFrequency = require("./solution");
+
+describe("testing the calculateFrequency function", () => {
+  test("testing with an empty array", () => {
+    const input = [];
+    const expectedOutput = calculateFrequency(input);
+    const targetOutput = 0;
+    expect(expectedOutput).toEqual(targetOutput);
+  });
+  test("testing with an array with positive numbers", () => {
+    const input = [1, 2, 3, 4];
+    const expectedOutput = calculateFrequency(input);
+    const targetOutput = 10;
+    expect(expectedOutput).toEqual(targetOutput);
+  });
+  test("testing with an array with negative numbers", () => {
+    const input = [-1, -2, -3, -4];
+    const expectedOutput = calculateFrequency(input);
+    const targetOutput = -10;
+    expect(expectedOutput).toEqual(targetOutput);
+  });
+  test("testing with an array with positive and negative numbers", () => {
+    const input = [-1, 2, 3, -4];
+    const expectedOutput = calculateFrequency(input);
+    const targetOutput = 0;
+    expect(expectedOutput).toEqual(targetOutput);
+  });
+  test("testing with an array with characters", () => {
+    const input = ["a", "b", "c", "d"];
+    const expectedOutput = calculateFrequency(input);
+    const targetOutput = 0;
+    expect(expectedOutput).toEqual(targetOutput);
+  });
+});