chore: adds completed functions for lesson7 and part_c

Author: mercedes-mathews

lesson_07/conditionals/src/lesson7.ts

@@ -11,10 +11,13 @@ 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.
-
-  return 0;
+  if (distance < 0) {
+    return -1;
+  } else if (distance > 0) {
+    return 1;
+  } else {
+    return 0;
+  }
 }
 
 /**
@@ -24,7 +27,15 @@ 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;
+  } else {
+    let result = 1;
+    for (let i = 2; i <= n; i++) {
+      result = result * i;
+    }
+    return result;
+  }
 }
 
 /**
@@ -34,7 +45,16 @@ 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 [];
+  }
+  const resultsArr: number[] = [1, 1];
+  if (n > 1) {
+    for (let i = 2; i < n; i++) {
+      resultsArr.push(resultsArr[i - 1] + resultsArr[i - 2]);
+    }
+  }
+  return resultsArr;
 }
 
 /**
@@ -60,7 +80,13 @@ 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] === value) {
+    return pivotIndex;
+  } else if (values[pivotIndex] < value) {
+    return binarySearch(values, pivotIndex + 1, end, value);
+  } else {
+    return binarySearch(values, start, pivotIndex - 1, value);
+  }
   // 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;

lesson_07/conditionals/src/part_c.ts

@@ -6,6 +6,9 @@
  * @returns
  */
 export function isStrongPassword(password: string): boolean {
+  if (password.length >= 8) {
+    return /\d/.test(password) && /[A-Z]/.test(password);
+  }
   return false;
 }
 
@@ -16,7 +19,33 @@ export function isStrongPassword(password: string): boolean {
  * @returns
  */
 export function getDayOfWeek(day: number): string {
-  return "";
+  let result = "";
+  switch (day) {
+    case 0:
+      result = "Sunday";
+      break;
+    case 1:
+      result = "Monday";
+      break;
+    case 2:
+      result = "Tuesday";
+      break;
+    case 3:
+      result = "Wednesday";
+      break;
+    case 4:
+      result = "Thursday";
+      break;
+    case 5:
+      result = "Friday";
+      break;
+    case 6:
+      result = "Saturday";
+      break;
+    default:
+      result = "";
+  }
+  return result;
 }
 
 /**
@@ -31,5 +60,13 @@ export function getDayOfWeek(day: number): string {
  * @returns
  */
 export function getTicketPrice(age: number): number {
-  return 0;
+  if (age < 5) {
+    return 0;
+  } else if (age >= 5 && age <= 17) {
+    return 10;
+  } else if (age >= 18 && age <= 59) {
+    return 20;
+  } else {
+    return 15;
+  }
 }