mgjam

class MyService
{
    /* ... dependencies ... */
    
    MyResult Process(MyParams params)
    {
        if (!IsSerialCodeValid(params.SerialCode)) return MyResult.InvalidSerialCode;
        var externalId = GetExternalId(params.SerialCode);
        StoreData(params.SerialCode, externalId);
        Report(params.SerialCode, externalId);

mgjam

class MyService
{
    private readonly ISerialCodeValidator serialCodeValidator;
    private readonly IExternalIdService externalIdService;
    private readonly IDataService dataService;
    private readonly IReportingService reportingService;
    
    MyResult Process(MyParams params)
    {
        if (!serialCodeValidator.IsSerialCodeValid(params.SerialCode)) return MyResult.InvalidSerialCode;

mgjam

class EmailValidator
{
    /* dependencies */

    bool IsEmailValid(string email)
    {
        if ((email?.Length ?? 0) < 3) return false;
        if (!Regex.IsMatch(email, myPattern)) return false;
        if (myBlacklistService.IsEmailBlacklisted(email)) return false;
        return true;

mgjam

class EmailValidator
{
    private readonly IEmailLengthValidation emailLengthValidation;
    private readonly IEmailRegexValidation emailRegexValidation;
    private readonly IEmailBlacklistValidation emailBlacklistValidation;

    bool IsEmailValid(string email)
    {
        if (!emailLengthValidation.IsEmailValid(email)) return false;
        if (!emailRegexValidation.IsEmailValid(email)) return false;

mgjam

class EmailValidator
{
    private readonly IEnumerable<IEmailValidation> emailValidations;
    /*...ctor...*/
    bool IsEmailValid(string email) => emailValidations
        .Aggregate(true, (acc, src) => acc ? src.IsEmailValid(email) : acc);
}

interface IEmailValidation
{

mgjam

class Processor
{
    // .. dependencies

    void Process(MyInput input)
    {
        if (ValidateInput(input))
        {
            new DatabaseConnection(...).ExecuteSql("...");
        }

mgjam

var serviceCollection = new ServiceCollection();

serviceCollection.AddTransient<IHttpService, HttpService>();
serviceCollection.AddTransient<IService, LoggingService>();

mgjam

class MyDto
{
    public string MyQueryStringValue { get; set; }
    public string[] MyQuerystringArray { get; set; }
}

mgjam

// myApiResource: Resource defined

myApiResource.addMethod(
    ...http_method...,
    {
        ...lambda_integration_options...
        requestTemplates: 'application/json': `{
            "MyQueryStringValue": "$input.params('MyQueryStringValue')"
            #if ($input.params('MyQuerystringArray') != '')
            ,"MyQuerystringArray": $input.params('MyQuerystringArray')

mgjam

{
  ...,
  "multiValueQueryStringParameters": {
    "parameter1": [
      "value1",
      "value2"
    ],
    "parameter2": [
      "value"
    ]