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首页《Reliable JavaScript》：打造持久稳健的测试驱动开发实战指南

《Reliable JavaScript》：打造持久稳健的测试驱动开发实战指南

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"《Reliable JavaScript》是一本专门针对大型JavaScript应用程序可靠性问题的解决方案书籍。作者采用测试驱动的工作流程，通过详细的单元测试，向读者展示了各种JavaScript设计模式和架构的实践应用。本书共分为三部分：第一部分旨在奠定坚实的基础，包括软件工程实践、工具选择和构建可靠对象；第二部分着重于基于模式的代码测试，涵盖了回调、Promise、函数应用部分、记忆化等核心编程模式的正确使用；第三部分则进一步探讨了单例、工厂、沙箱、装饰器、策略和代理等设计模式的正确实现与使用。在Part I中，第1章强调了软件工程技能的重要性，而第2章和第3章分别介绍了必要的开发工具和如何构建能够抵御时间考验的稳健对象。这部分为后续章节的深入讨论奠定了坚实的基础。进入Part II，作者带领读者审视每种设计模式带来的好处，并详细解释如何确保回调、Promise、部分函数应用、记忆化等模式的正确使用。这些章节对于理解和避免常见陷阱，提高代码的可维护性和可扩展性至关重要。 Part III聚焦于高级模式，如单例、工厂方法、沙箱模式（用于安全隔离代码）、装饰器模式（动态修改对象行为）、策略模式（行为替换）以及代理模式（数据封装和控制访问）。这部分内容对提升软件的灵活性和适应性具有极高的价值。《Reliable JavaScript》是一本适合商业软件开发者的实用指南，它不仅教授JavaScript技术，更强调通过测试驱动的方法来构建经得起考验的高质量代码。通过跟随书中的步骤和案例，读者将掌握如何将严谨的软件工程原则应用于JavaScript项目，从而提高代码的稳定性和可信赖度。无论是初学者还是经验丰富的开发者，这本书都能提供宝贵的知识和实践经验。"

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xiv

CONTENTS

ChaPter 7: ensurIng CorreCt use oF PartIaL

FunCtIon aPPLICatIon 145

Unit-Testing a Partial Function Application 145

Creating an Aspect for Partial Function Application 147

Distinguishing Between Partial Function Application

and Currying 149

Currying 149

Partial Function Application 149

Summary 150

ChaPter 8: ensurIng CorreCt use oF the

memoIzatIon Pattern 151

Understanding the Pattern Through Unit Tests 152

Adding Memoization with AOP 155

Creating the Memoization Aspect 155

Applying the returnValueCache Aspect to restaurantApi 159

Summary 160

ChaPter 9: ensurIng CorreCt ImPLementatIon

oF the sIngLeton Pattern 161

Understanding the Pattern Through Unit Tests 162

Implementing a Singleton Shared Cache with an Object Literal 162

Implementing a Singleton Shared Cache with a Module 166

Summary 170

ChaPter 10: ensurIng CorreCt ImPLementatIon

oF the FaCtory Pattern 173

Writing Unit Tests for a Factory 173

Implementing the Factory Pattern 179

Considering Other Factory Types 181

Summary 181

ChaPter 11: ensurIng CorreCt ImPLementatIon

and use oF the sandbox Pattern 183

Understanding the Pattern Through Unit Tests 184

Creating a Widget Sandbox 185

Instantiating a Widget Sandbox 185

Providing Tools to the Widget via the Sandbox 187

Creating and Testing Sandbox Tools 197

Creating Functions for Use with a Sandbox 201

Summary 203

CONTENTS

ChaPter 12: ensurIng CorreCt ImPLementatIon

oF the deCorator Pattern 205

Developing a Decorator the TestDriven Way 207

Writing a Fake for the Decorated Object 207

Writing Tests for Pass‐Through of Errors 208

Writing a Do‐Nothing Decorator 209

Adding Pass‐Through Functionality to the Decorator 210

Verifying Pass‐Through of Successes 213

Adding the Decorator’s Features 215

Generalizing the Decorator 222

Summary 222

ChaPter 13: ensurIng CorreCt ImPLementatIon

oF the strategy Pattern 223

Understanding the Pattern Through Unit Tests 223

Implementing the transportScheduler Without

the Strategy Pattern 224

Implementing the transportScheduler Using the

Strategy Pattern 226

Creating transportScheduler Using Test‐Driven Development 227

Creating a Strategy for Use with transportScheduler 235

Summary 237

ChaPter 14: ensurIng CorreCt ImPLementatIon oF

the Proxy Pattern 239

Developing a Proxy the TestDriven Way 240

Summary 256

ChaPter 15: ensurIng CorreCt ImPLementatIon oF

ChaInabLe methods 257

Understanding the Pattern Through Unit Tests 259

Chaining then 266

Summary 267

Part III: testIng and wrItIng wIth advanCed javasCrIPt Features

ChaPter 16: ConFormIng to InterFaCes In

an InterFaCe-Free Language 271

Understanding the Benets of Interfaces 272

Understanding the Interface Segregation Principle 273

xvi

CONTENTS

Using Test-Driven Development to Create a Contract Registry 275

Dening a Contract 275

Determining Whether a Contract Is Fullled 278

Asserting That a Contract Is Fullled 282

Bypassing Contract Enforcement 283

Creating an Aspect to Enforce a Contract on a Returned

(Created) Object 283

Summary 288

ChaPter 17: ensurIng CorreCt argument tyPes 289

Introduction 289

Understanding the Opportunities and Risks Posed

by JavaScript’s Type-Free Parameters 290

Extending the ContractRegistry to Check Arguments 290

Scoping Out the Task 291

Determining Whether Every Variable in a Set Fullls Its Contract 291

Asserting That Every Variable in a Set Fullls Its Contract 300

Packaging Argument-Checking in an Aspect 301

Supporting Contract Libraries 303

Putting It All Together 303

Creating the Contracts Modules 304

Creating the Application’s ContractRegistry 307

Bypassing Contracts for Production 307

Comparing the Aspect-Oriented Solution to a Static Solution 307

Considering the Advantages of TypeScript 308

Considering the Advantages of Aspects 308

Summary 308

ChaPter 18: ensurIng CorreCt use oF CaLL,

aPPLy, and bInd 311

Exploring How this Is Bound 312

Default Binding 312

Default Binding and strict Mode 313

Implicit Binding 314

new Binding 316

Explicit Binding 317

Creating and Testing Code That Uses call,

apply, and bind 317

Using call and apply 318

Creating an Array.prototype.forEach Polyll Using

Test-Driven Development 320

xvii

CONTENTS

Using bind 329

Summary 334

ChaPter 19: ensurIng the CorreCt use oF method‐

borrowIng 335

Ensuring the Borrowing Object Is Suitable 336

Making the Borrowed Function Qualify the Borrower 336

Attaching an Aspect to the Borrowed Object 338

Using a borrow() Method 342

Adding an Object‐Validator to the ContractRegistry 342

Anticipating Side Effects on the Borrower 343

Considering Side Effects from an Isolated Function 343

Considering Side Effects from a Function That Calls Other Functions 345

Anticipating Side Effects on the Donor Object 351

Summary 351

ChaPter 20: ensurIng CorreCt use oF mIxIns 353

Creating and Using Mixins 355

Creating and Using a Traditional Mixin 356

Creating the extend Function Using Test‐driven Development 356

Creating a Traditional Mixin Using Test‐driven Development 367

Creating and Using a Functional Mixin 373

Summary 380

ChaPter 21: testIng advanCed Program arChIteCtures 383

Ensuring Reliable Use of the Observer Pattern 384

Examining the Observer Pattern 384

Enhancing the Reliability of the Observer Pattern 391

Ensuring Reliable Use of the Mediator Pattern 395

Examining the Mediator Pattern 396

Enhancing the Reliability of Mediator-Based Code 397

Developing a Colleague 398

Testing a Colleague 399

Segregating the Mediator’s Interfaces 402

Deciding Where to Put the Contracts 403

Ensuring the Colleague Gets a Mediator with the

Expected Interface 404

Developing a Mediator 406

Testing the Mediator 408

Summary 410

xviii

CONTENTS

Part Iv: sPeCIaL subjeCts In testIng

ChaPter 22: testIng dom aCCess 413

Unit-Testing UI 414

Examining Difcult-to-Test UI Code 414

Creating a UI Component Using TDD 416

Testing Code That Changes the DOM 418

Testing to Ensure Event Handlers Are Executed 422

Keeping UI Tests from Being Brittle 425

Optimizing Your Code with a Proler 425

Detecting Inefciencies 426

Avoiding Premature Optimization 433

Summary 433

ChaPter 23: ensurIng ConFormanCe to standards 435

Using ESLint 436

Installing ESLint 436

Installing Node and npm 436

Installing ESLint Using npm 439

Running ESLint 439

Executing ESLint on a Single File 442

Executing ESLint on All the JavaScript Files in a Directory 443

Enforcing Coding Standards with ESLint 444

Creating a Custom ESLint Rule 445

Running ESLint with Custom Rules 448

Enforcing Architectural Divisions 449

The Family-Secret Technique 450

The Imprinting Technique 452

The Mission Impossible Technique 454

The Magic Wand Technique 459

Do Not Use the Call Stack Technique 460

Other Techniques 460

Other Architectures 460

Summary 460

Part v: summary

ChaPter 24: summary oF the PrInCIPLes

oF test-drIven deveLoPment 465

Recalling Why Test-Driven Development Is Worthwhile 465

Practicing Test-Driven Development 466

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JavaScript Functional Programming for JavaScript Developers (PDF, EPUB, MOBI)

By learning how to expose JavaScript's true identity as a functional language, we can implement web apps that are more powerful, easier to maintain and more reliable. The [removed] Functional ...

SMART框架.pdf

从所提供的文件内容来看，文件标题和描述都标注为“SMART框架.pdf”，这意味着文档围绕着SMART框架的相关知识进行阐述。SMART框架在IT领域一般不是特指某一个技术或框架，而是可能涉及到几个不同的概念。它可能是...

The attention mask and the pad token id were not set. As a consequence, you may observe unexpected behavior. Please pass your input's `attention_mask` to obtain reliable results. Setting `pad_token_id` to `eos_token_id`:50256 for open-end generation.

这个警告信息是在使用transformers库中的生成模型（如GPT-2）时出现的。这个警告信息是提醒你需要传递attention mask矩阵以确保生成结果的可靠性，同时将pad token的id设置为eos token的id，以便在生成过程中进行...

2.Consider the following table named "GYM" with details about fitness items being sold in the store. Write queries for following: a.To display the names of all the items whose name starts with "A". b.To display ICODEs and INAMEs of all items, whose Brandname is Reliable or Coscore.

a. To display the names of all the items whose name starts with "A": ``` SELECT INAME FROM GYM WHERE INAME LIKE 'A%'; ``` b. To display ICODEs and ...WHERE Brandname IN ('Reliable', 'Coscore'); ```

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《Reliable JavaScript》：打造持久稳健的测试驱动开发实战指南

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The attention mask and the pad token id were not set. As a consequence, you may observe unexpected behavior. Please pass your input's `attention_mask` to obtain reliable results. Setting `pad_token_id` to `eos_token_id`:50256 for open-end generation.

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