Add isAlpha validation function and API endpoint #123
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This PR adds a new
isAlphavalidation function that checks if a string contains only alphabetical characters (letters), along with its corresponding API endpoint.Changes Made
1. New Validation Function (
validationFunctions.js)isAlpha()static method to theValidationFunctionsclasstrueif input contains only letters (a-z, A-Z)falsefor strings with numbers, spaces, or special characters2. New API Endpoint (
server.js)POST /api/isAlphaendpoint3. Comprehensive Test Coverage
test/unit/isAlpha.test.js): Tests the validation function directlytest/integration/isAlpha.test.js): Tests the API endpointFunctionality
The
isAlphafunction validates that a string contains exclusively alphabetical characters:"hello"→true"HelloWorld"→true"ABC"→true"hello123"→false"hello world"→false"hello!"→falseTesting
Run the new tests with:
API Usage
POST /api/isAlpha Content-Type: application/json { "inputString": "hello" } # Response { "result": true }Related Issues
Closes #16 - Add API Call and Function for isAlpha