feat/ fixed changes for lesson 7

Author: angie-3

lesson_07/conditionals/src/lesson7.ts

@@ -7,7 +7,12 @@ import { computeLexicographicDistance } from "./util.js";
  * @return True if the age corresponds to a voting age and false otherwise.
  */
 export function canVote(age: number): boolean {
-  return false;
+  if (age >= 18) {
+    return true;
+  } else {
+    return false;
+  }
+  
 }
 
 /**
@@ -23,10 +28,12 @@ export function compareStrings(a: string, b: string): number {
   const distance = computeLexicographicDistance(a, b);
 
   // TODO(you): Finish this method.
+  if (distance < 0) {
+    return -1;
+  }
 
-  return 0;
+  return distance;
 }
-
 /**
  * Converts a GPA on the 4.0 scale to the corresponding letter grade using the college board
  * scale. See
@@ -37,17 +44,46 @@ export function compareStrings(a: string, b: string): number {
  * @return The letter grade ("A+", "A", "A-", "B+", etc.).
  */
 export function convertGpaToLetterGrade(gpa: number): string {
-  return "F";
+  if (gpa === 4.0) {
+    return "A";
+  } else if (gpa > 4.0) {
+    return "A";
+  } else if (gpa <= 3.99 && gpa >= 3.7) {
+    return "A-";
+  } else if (gpa <= 3.69 && gpa >= 3.3) {
+    return "B+";
+  } else if (gpa <= 3.29 && gpa >= 3.0) {
+    return "B";
+  } else if (gpa <= 2.99 && gpa >= 2.7) {
+    return "B-";
+  } else if (gpa <= 2.69 && gpa >= 2.3) {
+    return "C+";
+  } else if (gpa <= 2.29 && gpa >= 2.0) {
+    return "C";
+  } else if (gpa <= 1.99 && gpa >= 1.7) {
+    return "C-";
+  } else if (gpa <= 1.69 && gpa >= 1.3) {
+    return "D+";
+  } else if (gpa <= 1.29 && gpa >= 1.0) {
+    return "D";
+  } else {
+    return "F";
+  }
 }
 
-/**
- * Computes the factorial of the given value of `n`.
+/**km
+ * computes the factorial of the given value of `n`.
  *
  * @param n The value for which to compute the factorial.
  * @return The factorial of n.
  */
 export function computeFactorial(n: number): number {
-  return 0;
+  let product = 1;
+  for (let i = 1; i <= n; i++) {
+    product *= i;
+  }
+
+  return product;
 }
 
 /**
@@ -57,7 +93,12 @@ export function computeFactorial(n: number): number {
  * @return The sum of all the values.
  */
 export function addNumbers(values: number[]): number {
-  return 0;
+  let sum = 0; //initialize variable
+
+  for (const value of values) {
+    sum += value; //adds value to each
+  }
+  return sum;
 }
 
 /**
@@ -67,7 +108,21 @@ export function addNumbers(values: number[]): number {
  * @return An array containing the first `n` Fibonacci values.
  */
 export function getFirstNFibonacciNumbers(n: number): number[] {
-  return [];
+  let current = 1;
+  let prev = 0;
+
+  const numbers = [];
+
+  for (let i = 1; i<=n; i++){
+    numbers.push(current);
+    const nextNum = current + prev; // 1
+    prev = current; // 1
+    current = nextNum
+  }
+  
+   
+  
+  return numbers;
 }
 
 /**
@@ -86,12 +141,22 @@ export function binarySearch(
   value: number,
 ): number {
   if (end < start) {
+
+    
     // The range is not valid so just return -1.
     return -1;
   }
 
   const pivotIndex = Math.floor((start + end) / 2); // The index in the middle of the array.
-
+  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);
+}
   // TODO(you): Finish implementing this algorithm
 
   // If values[pivotIndex] is equal to value then return `pivotIndex`.

lesson_08/algos/src/test.ts

@@ -0,0 +1,46 @@
+function printPermutations(value: string, answer: string): void {
+  if (value.length === 0) {
+    console.log(answer);
+    return;
+  }
+
+  for (let i = 0; i < value.length; i++) {
+    const ch = value.charAt(i);
+    const left = value.substring(0, i);
+    const right = value.substring(i + 1);
+    const rest = left + right;
+    printPermutations(rest, answer + ch);
+  }
+}
+
+function printPermutations(value: string, answer: string): void{
+    if (value.length ===0){
+        console.log(answer);
+        return;
+    }
+    for (let i = 0; i < value.length; i++) {
+        const ch = value.charAt(i);
+        
+    }
+
+    }
+}
+
+
+
+
+function reverseString(input: string): string {
+  if (input.length === 0) {
+    return input;
+  }
+
+  const charArray = input.split('');
+
+  for (let i = 0; i < charArray.length / 2; i++) {
+    // Compute the corresponding index from the back of the string.
+    const j = charArray.length - i - 1;
+    swapCharacters(charArray, i, j);
+  }
+
+  return charArray.join('');
+}