chore: jwatson lesson_07 homework

Author: jxwatson251

lesson_07/conditionals/src/lesson7.ts

@@ -1,3 +1,4 @@
+import { error } from "console";
 import { computeLexicographicDistance } from "./util.js";
 
 /**
@@ -11,9 +12,8 @@ export function compareStrings(a: string, b: string): number {
   // The distance will be a number less than 0 if string `a` is lexicographically less than `b`, 1
   // if it is greater, and 0 if the strings are equal.
   const distance = computeLexicographicDistance(a, b);
-
-  // TODO(you): Finish this method.
-
+  if (distance < 0) return -1;
+  if (distance > 0) return 1;
   return 0;
 }
 
@@ -24,7 +24,17 @@ export function compareStrings(a: string, b: string): number {
  * @return The factorial of n.
  */
 export function computeFactorial(n: number): number {
-  return 0;
+  if (n < 0) {
+    return 0;
+  }
+  if (n === 0 || n === 1) {
+    return 1;
+  }
+  let result = 1;
+  for (let i = 2; i <= n; i++) {
+    result *= i;
+  }
+  return result;
 }
 
 /**
@@ -34,7 +44,14 @@ export function computeFactorial(n: number): number {
  * @return An array containing the first `n` Fibonacci values.
  */
 export function getFirstNFibonacciNumbers(n: number): number[] {
-  return [];
+  if (n <= 0) return [];
+  if (n === 1) return [0];
+
+  const fibSeries: number[] = [1, 1];
+for (let i = 2; i < n; i++) {
+  fibSeries.push(fibSeries[i - 1] + fibSeries[i - 2]);
+}
+return fibSeries;
 }
 
 /**
@@ -58,12 +75,16 @@ export function binarySearch(
   }
 
   const pivotIndex = Math.floor((start + end) / 2); // The index in the middle of the array.
-
-  // TODO(you): Finish implementing this algorithm
-
-  // If values[pivotIndex] is equal to value then return `pivotIndex`.
-  // Else if values[pivotIndex] is greater than the value, then
-  // call `binarySearch(values, start, pivotIndex - 1, value)` and return its value;
-  // Else call `binarySearch(values, pivotIndex + 1, end, value)` and return its value.
+  if (values[pivotIndex] === value) {
+    return pivotIndex;
+  } else if (values[pivotIndex] > value) {
+    return binarySearch(values, start, pivotIndex - 1, value);
+  } else {
+    return binarySearch(values, pivotIndex + 1, end, value);
+  }
   return -1;
 }
+// If values[pivotIndex] is equal to value then return `pivotIndex`.
+// Else if values[pivotIndex] is greater than the value, then
+// call `binarySearch(values, start, pivotIndex - 1, value)` and return its value;
+// Else call `binarySearch(values, pivotIndex + 1, end, value)` and return its value.

lesson_07/conditionals/src/part_b.ts

@@ -6,6 +6,16 @@
  */
 export function isLeapYear(year: number): boolean {
   return false;
+  switch (true) {
+    case year % 4 === 0:
+      return true;
+    case year % 100 === 0:
+      return false;
+    case year % 400 === 0:
+      return true;
+    default:
+      return false;
+  }
 }
 
 /**
@@ -15,6 +25,12 @@ export function isLeapYear(year: number): boolean {
  * @returns
  */
 export function isEvenOrOdd(num: number): string {
+  if (num % 2 === 0) {
+    return "even";
+  }
+  if (num % 2 !== 0) {
+    return "odd";
+  }
   return "";
 }
 
@@ -25,5 +41,8 @@ export function isEvenOrOdd(num: number): string {
  * @returns
  */
 export function hasVowel(word: string): boolean {
+  if (word.match(/[aeiou]/i)) {
+    return true;
+  }
   return false;
 }