商品描述
Learn how to write R code with fewer bugs.
The problem with programming is that you are always one typo away from writing something silly. Likewise with data analysis, a small mistake in your model can lead to a big mistake in your results. Combining the two disciplines means that it is all too easy for a missed minus sign to generate a false prediction that you don't spot until it's too late. Testing is the only way to be sure that your code, and your results, are correct.
Testing R Code teaches you how to perform development-time testing using the testthat package, allowing you to ensure that your code works as intended. The book also teaches run-time testing using the assertive package; enabling your users to correctly run your code.
After beginning with an introduction to testing in R, the book explores more advanced cases such as integrating tests into R packages; testing code that accesses databases; testing C++ code with Rcpp; and testing graphics. Each topic is explained with real-world examples, and has accompanying exercises for readers to practise their skills -- only a small amount of experience with R is needed to get started
商品描述(中文翻譯)
學習如何撰寫更少錯誤的 R 代碼。
程式設計的問題在於，你總是距離一個打錯字的錯誤只有一步之遙。同樣地，在數據分析中，模型中的小錯誤可能會導致結果中的重大錯誤。將這兩個學科結合在一起，意味著錯過一個負號可能會產生一個你直到為時已晚才發現的錯誤預測。測試是確保你的代碼和結果正確的唯一方法。
《測試 R 代碼》教你如何使用 testthat 套件進行開發時測試，讓你能夠確保你的代碼按預期運作。這本書還教你如何使用 assertive 套件進行執行時測試，使你的用戶能夠正確運行你的代碼。
在介紹 R 中的測試後，這本書探討了更高級的案例，例如將測試整合到 R 套件中；測試訪問數據庫的代碼；使用 Rcpp 測試 C++ 代碼；以及測試圖形。每個主題都用真實世界的例子進行解釋，並附有練習題讓讀者練習技能——只需少量的 R 經驗即可開始。
