feat: implemented all the lesson 07 functions

Author: jimoye244

lesson_07/conditionals/src/lesson7.ts

@@ -7,7 +7,10 @@ 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;
 }
 
 /**
@@ -21,10 +24,15 @@ 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);
+  if(distance === 0 )
+    return 0;
+  else if (distance > 0)
+    return 1;
+  else 
+     return -1;
 
   // TODO(you): Finish this method.
-
-  return 0;
+ // return 0;
 }
 
 /**
@@ -37,7 +45,28 @@ 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 >= 3.7 && gpa <= 3.99)
+    return "A-";
+  else if(gpa >= 3.3 && gpa <= 3.69)
+    return "B+";
+  else if(gpa >= 3.0 && gpa <= 3.29)
+    return "B";
+  else if(gpa >= 2.7 && gpa <= 2.99)
+    return "B-";
+  else if(gpa>=2.3 && gpa <= 2.69)
+    return "C+";
+  else if(gpa >= 2.0 && gpa <= 2.29)
+    return "C";
+  else if(gpa >= 1.7 && gpa <= 1.99)
+    return "C-";
+  else if(gpa >= 1.3 && gpa <= 1.69)
+    return "D+";
+  else if(gpa >= 1 && gpa <= 1.29)
+    return "D";
+  else (gpa === 0.99)
+    return "F";
 }
 
 /**
@@ -47,7 +76,12 @@ export function convertGpaToLetterGrade(gpa: number): string {
  * @return The factorial of n.
  */
 export function computeFactorial(n: number): number {
-  return 0;
+   if(n === 0) {
+        return 1;
+   }     
+    else{ 
+        return n * computeFactorial(n-1);
+    }     
 }
 
 /**
@@ -57,7 +91,11 @@ export function computeFactorial(n: number): number {
  * @return The sum of all the values.
  */
 export function addNumbers(values: number[]): number {
-  return 0;
+  let sum = 0;
+  for(const value of values){
+     sum = sum + value;
+  }
+  return sum;
 }
 
 /**
@@ -67,7 +105,20 @@ export function addNumbers(values: number[]): number {
  * @return An array containing the first `n` Fibonacci values.
  */
 export function getFirstNFibonacciNumbers(n: number): number[] {
-  return [];
+    const resultArray :number[] =[];
+    if( n == 0)
+      return resultArray; 
+    resultArray.push(1);
+    let firstNumber: number = 1;
+    let secondNumber: number = 1;
+    let nextNumber : number = 0; 
+    for(let i: number = 1; i < n; i++ ){
+      nextNumber = firstNumber + secondNumber;
+      resultArray.push(secondNumber);
+      firstNumber = secondNumber;
+      secondNumber = nextNumber; 
+    }   
+  return resultArray;
 }
 
 /**
@@ -93,10 +144,20 @@ 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){
+        const posGreaterThanPivotIndex = binarySearch(values, start, pivotIndex - 1, value);
+        return posGreaterThanPivotIndex;
+    }
+     else{
+        const posLessThanPivotIndex = binarySearch(values, pivotIndex + 1, end, value);
+         return posLessThanPivotIndex;
+    }
   // 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.
-  return -1;
+  //return -1;
 }