Improve variable and function name descriptiveness across backend and frontend

api/CourseRegistration.API/Controllers/CoursesController.cs

@@ -44,8 +44,8 @@ public async Task<ActionResult<ApiResponseDto<PagedResponseDto<CourseDto>>>> Get
         _logger.LogInformation("Getting courses with page: {Page}, pageSize: {PageSize}, searchTerm: {SearchTerm}, instructor: {Instructor}", 
             page, pageSize, searchTerm, instructor);
 
-        var result = await _courseService.GetCoursesAsync(page, pageSize, searchTerm, instructor);
-        return Ok(ApiResponseDto<PagedResponseDto<CourseDto>>.SuccessResponse(result, "Courses retrieved successfully"));
+        var pagedCourses = await _courseService.GetCoursesAsync(page, pageSize, searchTerm, instructor);
+        return Ok(ApiResponseDto<PagedResponseDto<CourseDto>>.SuccessResponse(pagedCourses, "Courses retrieved successfully"));
     }
 
     /// <summary>
@@ -125,8 +125,8 @@ public async Task<ActionResult<ApiResponseDto<object>>> DeleteCourse(Guid id)
     {
         _logger.LogInformation("Deleting course with ID: {CourseId}", id);
 
-        var result = await _courseService.DeleteCourseAsync(id);
-        if (!result)
+        var isCourseDeleted = await _courseService.DeleteCourseAsync(id);
+        if (!isCourseDeleted)
         {
             return NotFound(ApiResponseDto<object>.ErrorResponse("Course not found"));
         }

api/CourseRegistration.API/Controllers/RegistrationsController.cs

@@ -47,8 +47,8 @@ public async Task<ActionResult<ApiResponseDto<PagedResponseDto<RegistrationDto>>
         _logger.LogInformation("Getting registrations with page: {Page}, pageSize: {PageSize}, studentId: {StudentId}, courseId: {CourseId}, status: {Status}", 
             page, pageSize, studentId, courseId, status);
 
-        var result = await _registrationService.GetRegistrationsAsync(page, pageSize, studentId, courseId, status);
-        return Ok(ApiResponseDto<PagedResponseDto<RegistrationDto>>.SuccessResponse(result, "Registrations retrieved successfully"));
+        var pagedRegistrations = await _registrationService.GetRegistrationsAsync(page, pageSize, studentId, courseId, status);
+        return Ok(ApiResponseDto<PagedResponseDto<RegistrationDto>>.SuccessResponse(pagedRegistrations, "Registrations retrieved successfully"));
     }
 
     /// <summary>
@@ -132,8 +132,8 @@ public async Task<ActionResult<ApiResponseDto<object>>> CancelRegistration(Guid
     {
         _logger.LogInformation("Cancelling registration with ID: {RegistrationId}", id);
 
-        var result = await _registrationService.CancelRegistrationAsync(id);
-        if (!result)
+        var isRegistrationCancelled = await _registrationService.CancelRegistrationAsync(id);
+        if (!isRegistrationCancelled)
         {
             return NotFound(ApiResponseDto<object>.ErrorResponse("Registration not found"));
         }

api/CourseRegistration.API/Controllers/StudentsController.cs

@@ -39,8 +39,8 @@ public async Task<ActionResult<ApiResponseDto<PagedResponseDto<StudentDto>>>> Ge
     {
         _logger.LogInformation("Getting students with page: {Page}, pageSize: {PageSize}", page, pageSize);
 
-        var result = await _studentService.GetStudentsAsync(page, pageSize);
-        return Ok(ApiResponseDto<PagedResponseDto<StudentDto>>.SuccessResponse(result, "Students retrieved successfully"));
+        var pagedStudents = await _studentService.GetStudentsAsync(page, pageSize);
+        return Ok(ApiResponseDto<PagedResponseDto<StudentDto>>.SuccessResponse(pagedStudents, "Students retrieved successfully"));
     }
 
     /// <summary>
@@ -119,8 +119,8 @@ public async Task<ActionResult<ApiResponseDto<object>>> DeleteStudent(Guid id)
     {
         _logger.LogInformation("Deleting student with ID: {StudentId}", id);
 
-        var result = await _studentService.DeleteStudentAsync(id);
-        if (!result)
+        var isStudentDeleted = await _studentService.DeleteStudentAsync(id);
+        if (!isStudentDeleted)
         {
             return NotFound(ApiResponseDto<object>.ErrorResponse("Student not found"));
         }

api/CourseRegistration.API/Middleware/ExceptionHandlingMiddleware.cs

@@ -45,10 +45,10 @@ private async Task HandleExceptionAsync(HttpContext context, Exception exception
 
         _logger.LogError(exception, "An unhandled exception occurred. CorrelationId: {CorrelationId}", correlationId);
 
-        var response = context.Response;
-        response.ContentType = "application/json";
+        var httpResponse = context.Response;
+        httpResponse.ContentType = "application/json";
 
-        var errorResponse = new ApiResponseDto<object>
+        var apiErrorResponse = new ApiResponseDto<object>
         {
             Success = false,
             Data = null
@@ -57,58 +57,58 @@ private async Task HandleExceptionAsync(HttpContext context, Exception exception
         switch (exception)
         {
             case ArgumentException argEx:
-                response.StatusCode = (int)HttpStatusCode.BadRequest;
-                errorResponse.Message = "Invalid argument provided";
-                errorResponse.Errors = new[] { argEx.Message };
+                httpResponse.StatusCode = (int)HttpStatusCode.BadRequest;
+                apiErrorResponse.Message = "Invalid argument provided";
+                apiErrorResponse.Errors = new[] { argEx.Message };
                 break;
 
             case InvalidOperationException invOpEx:
-                response.StatusCode = (int)HttpStatusCode.BadRequest;
-                errorResponse.Message = "Invalid operation";
-                errorResponse.Errors = new[] { invOpEx.Message };
+                httpResponse.StatusCode = (int)HttpStatusCode.BadRequest;
+                apiErrorResponse.Message = "Invalid operation";
+                apiErrorResponse.Errors = new[] { invOpEx.Message };
                 break;
 
             case UnauthorizedAccessException:
-                response.StatusCode = (int)HttpStatusCode.Unauthorized;
-                errorResponse.Message = "Unauthorized access";
-                errorResponse.Errors = new[] { "You are not authorized to perform this action" };
+                httpResponse.StatusCode = (int)HttpStatusCode.Unauthorized;
+                apiErrorResponse.Message = "Unauthorized access";
+                apiErrorResponse.Errors = new[] { "You are not authorized to perform this action" };
                 break;
 
             case KeyNotFoundException:
-                response.StatusCode = (int)HttpStatusCode.NotFound;
-                errorResponse.Message = "Resource not found";
-                errorResponse.Errors = new[] { "The requested resource was not found" };
+                httpResponse.StatusCode = (int)HttpStatusCode.NotFound;
+                apiErrorResponse.Message = "Resource not found";
+                apiErrorResponse.Errors = new[] { "The requested resource was not found" };
                 break;
 
             case TimeoutException:
-                response.StatusCode = (int)HttpStatusCode.RequestTimeout;
-                errorResponse.Message = "Request timeout";
-                errorResponse.Errors = new[] { "The request timed out" };
+                httpResponse.StatusCode = (int)HttpStatusCode.RequestTimeout;
+                apiErrorResponse.Message = "Request timeout";
+                apiErrorResponse.Errors = new[] { "The request timed out" };
                 break;
 
             default:
-                response.StatusCode = (int)HttpStatusCode.InternalServerError;
-                errorResponse.Message = "An internal server error occurred";
+                httpResponse.StatusCode = (int)HttpStatusCode.InternalServerError;
+                apiErrorResponse.Message = "An internal server error occurred";
 
                 // In development, include the full exception details
                 if (context.RequestServices.GetService<IWebHostEnvironment>()?.IsDevelopment() == true)
                 {
-                    errorResponse.Errors = new[] { exception.Message, exception.StackTrace ?? string.Empty };
+                    apiErrorResponse.Errors = new[] { exception.Message, exception.StackTrace ?? string.Empty };
                 }
                 else
                 {
-                    errorResponse.Errors = new[] { "Please contact support with correlation ID: " + correlationId };
+                    apiErrorResponse.Errors = new[] { "Please contact support with correlation ID: " + correlationId };
                 }
                 break;
         }
 
-        var jsonOptions = new JsonSerializerOptions
+        var camelCaseJsonOptions = new JsonSerializerOptions
         {
             PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
             WriteIndented = true
         };
 
-        var jsonResponse = JsonSerializer.Serialize(errorResponse, jsonOptions);
-        await response.WriteAsync(jsonResponse);
+        var jsonResponse = JsonSerializer.Serialize(apiErrorResponse, camelCaseJsonOptions);
+        await httpResponse.WriteAsync(jsonResponse);
     }
 }

api/CourseRegistration.Application/Services/AdminAccessChecker.cs

@@ -275,65 +275,65 @@ private static bool IsOutsideBusinessHours(DateTime currentTime)
     /// <returns>AdminValidationResult with detailed validation information</returns>
     public static AdminValidationResult ValidateAdminAccess(User? user, ClaimsPrincipal? principal, ILogger? logger = null)
     {
-        var result = new AdminValidationResult();
+        var adminValidationResult = new AdminValidationResult();
 
         try
         {
             // User object validation
-            result.UserObjectValid = user != null;
-            if (!result.UserObjectValid)
+            adminValidationResult.UserObjectValid = user != null;
+            if (!adminValidationResult.UserObjectValid)
             {
-                result.FailureReason = "User object is null";
-                logger?.LogWarning("Admin validation failed: {Reason}", result.FailureReason);
-                return result;
+                adminValidationResult.FailureReason = "User object is null";
+                logger?.LogWarning("Admin validation failed: {Reason}", adminValidationResult.FailureReason);
+                return adminValidationResult;
             }
 
             // Account status validation
-            result.AccountActive = user!.IsActive;
-            if (!result.AccountActive)
+            adminValidationResult.AccountActive = user!.IsActive;
+            if (!adminValidationResult.AccountActive)
             {
-                result.FailureReason = "User account is inactive";
-                logger?.LogWarning("Admin validation failed for user {UserId}: {Reason}", user.UserId, result.FailureReason);
-                return result;
+                adminValidationResult.FailureReason = "User account is inactive";
+                logger?.LogWarning("Admin validation failed for user {UserId}: {Reason}", user.UserId, adminValidationResult.FailureReason);
+                return adminValidationResult;
             }
 
             // Role validation
-            result.HasValidRole = user.Role == UserRole.Admin || user.Role == UserRole.SuperAdmin;
-            if (!result.HasValidRole)
+            adminValidationResult.HasValidRole = user.Role == UserRole.Admin || user.Role == UserRole.SuperAdmin;
+            if (!adminValidationResult.HasValidRole)
             {
-                result.FailureReason = $"User has insufficient role: {user.Role}";
-                logger?.LogInformation("Admin validation failed for user {UserId}: {Reason}", user.UserId, result.FailureReason);
-                return result;
+                adminValidationResult.FailureReason = $"User has insufficient role: {user.Role}";
+                logger?.LogInformation("Admin validation failed for user {UserId}: {Reason}", user.UserId, adminValidationResult.FailureReason);
+                return adminValidationResult;
             }
 
             // Claims validation
-            result.ClaimsValid = HasAdminAccessFromClaims(principal, logger);
-            if (!result.ClaimsValid)
+            adminValidationResult.ClaimsValid = HasAdminAccessFromClaims(principal, logger);
+            if (!adminValidationResult.ClaimsValid)
             {
-                result.FailureReason = "Invalid or missing claims";
-                return result;
+                adminValidationResult.FailureReason = "Invalid or missing claims";
+                return adminValidationResult;
             }
 
             // Time-based validation
-            result.WithinAllowedTime = ValidateSecureAdminAccess(user, DateTime.UtcNow, logger);
-            if (!result.WithinAllowedTime)
+            adminValidationResult.WithinAllowedTime = ValidateSecureAdminAccess(user, DateTime.UtcNow, logger);
+            if (!adminValidationResult.WithinAllowedTime)
             {
-                result.FailureReason = "Access denied due to time restrictions";
-                return result;
+                adminValidationResult.FailureReason = "Access denied due to time restrictions";
+                return adminValidationResult;
             }
 
-            result.IsValid = true;
-            result.ValidatedAt = DateTime.UtcNow;
+            adminValidationResult.IsValid = true;
+            adminValidationResult.ValidatedAt = DateTime.UtcNow;
 
             logger?.LogInformation("Admin access validation successful for user {UserId}", user.UserId);
 
-            return result;
+            return adminValidationResult;
         }
         catch (Exception ex)
         {
-            result.FailureReason = "Validation error occurred";
+            adminValidationResult.FailureReason = "Validation error occurred";
             logger?.LogError(ex, "Error during admin access validation for user {UserId}", user?.UserId);
-            return result;
+            return adminValidationResult;
         }
     }
 }

api/CourseRegistration.Infrastructure/Repositories/Repository.cs

@@ -76,8 +76,8 @@ public virtual async Task<IEnumerable<T>> FindAsync(Expression<Func<T, bool>> pr
     /// </summary>
     public virtual async Task<T> AddAsync(T entity)
     {
-        var result = await _dbSet.AddAsync(entity);
-        return result.Entity;
+        var addedEntityEntry = await _dbSet.AddAsync(entity);
+        return addedEntityEntry.Entity;
     }
 
     /// <summary>

frontend/script.js

@@ -3,7 +3,7 @@ const API_BASE_URL = 'http://localhost:5210/api';
 
 // DOM Elements
 const addCourseForm = document.getElementById('add-course-form');
-const submitBtn = document.getElementById('submit-btn');
+const submitButton = document.getElementById('submit-btn');
 const submitText = document.getElementById('submit-text');
 const loadingOverlay = document.getElementById('loading-overlay');
 
@@ -61,12 +61,12 @@ function initializeForm() {
     addCourseForm.addEventListener('submit', handleFormSubmit);
 
     // Instructor name validation (letters, spaces, periods only)
-    document.getElementById('instructorName').addEventListener('input', function(e) {
-        const value = e.target.value;
+    document.getElementById('instructorName').addEventListener('input', function(inputEvent) {
+        const value = inputEvent.target.value;
         const validPattern = /^[a-zA-Z\s.]*$/;
 
         if (!validPattern.test(value)) {
-            e.target.value = value.replace(/[^a-zA-Z\s.]/g, '');
+            inputEvent.target.value = value.replace(/[^a-zA-Z\s.]/g, '');
         }
     });
 
@@ -80,8 +80,8 @@ function initializeForm() {
 }
 
 // Form Submission Handler
-async function handleFormSubmit(e) {
-    e.preventDefault();
+async function handleFormSubmit(submitEvent) {
+    submitEvent.preventDefault();
 
     if (!validateForm()) {
         return;
@@ -252,8 +252,8 @@ function clearAllErrors() {
     const errorElements = document.querySelectorAll('.error-message');
     const inputElements = document.querySelectorAll('.form-input, .form-textarea');
 
-    errorElements.forEach(el => el.textContent = '');
-    inputElements.forEach(el => el.classList.remove('error'));
+    errorElements.forEach(errorElement => errorElement.textContent = '');
+    inputElements.forEach(inputElement => inputElement.classList.remove('error'));
 }
 
 function displayValidationErrors(errors) {
@@ -285,13 +285,13 @@ function mapFieldName(apiFieldName) {
 
 // UI State Functions
 function setSubmitButton(loading, text) {
-    submitBtn.disabled = loading;
+    submitButton.disabled = loading;
     submitText.textContent = text;
 
     if (loading) {
-        submitBtn.innerHTML = `<i class="fas fa-spinner fa-spin"></i> ${text}`;
+        submitButton.innerHTML = `<i class="fas fa-spinner fa-spin"></i> ${text}`;
     } else {
-        submitBtn.innerHTML = `<i class="fas fa-plus"></i> ${text}`;
+        submitButton.innerHTML = `<i class="fas fa-plus"></i> ${text}`;
     }
 }
 
@@ -566,18 +566,18 @@ function getCourseStatusText(startDate, endDate) {
 }
 
 // Keyboard Navigation
-document.addEventListener('keydown', function(e) {
+document.addEventListener('keydown', function(keyboardEvent) {
     // Close modals with Escape key
-    if (e.key === 'Escape') {
+    if (keyboardEvent.key === 'Escape') {
         const openModals = document.querySelectorAll('.modal:not(.hidden)');
         openModals.forEach(modal => modal.classList.add('hidden'));
     }
 });
 
 // Click outside modal to close
-document.addEventListener('click', function(e) {
-    if (e.target.classList.contains('modal')) {
-        e.target.classList.add('hidden');
+document.addEventListener('click', function(clickEvent) {
+    if (clickEvent.target.classList.contains('modal')) {
+        clickEvent.target.classList.add('hidden');
     }
 });
 
@@ -760,8 +760,8 @@ async function loadCoursesForDropdown() {
 document.addEventListener('DOMContentLoaded', function() {
     const createRegistrationForm = document.getElementById('create-registration-form');
     if (createRegistrationForm) {
-        createRegistrationForm.addEventListener('submit', async function(e) {
-            e.preventDefault();
+        createRegistrationForm.addEventListener('submit', async function(submitEvent) {
+            submitEvent.preventDefault();
 
             const formData = {
                 studentId: document.getElementById('registration-student').value,