How deeply does "Looks Good to Me" cover bug?

Distinguishes obvious, subtle, hidden, low-level, and functionality defects but stops short of a general debugging procedure.

Bug

As explained in "Looks Good to Me"

An error or flaw in software that can cause incorrect, unsafe, or undesirable behavior.

A bug is an error or defect that produces incorrect behavior or allows defect-prone code into released software. Code reviews can expose errors the original developer missed, but their bug-finding role remains debated. section 1.3.1 section 3.1.1

Treat bug detection as one part of a broader quality strategy:

Use unit tests and developer checks to catch expected failures before review. section 3.1.1
Use review to catch subtle functionality errors that tests or the original author missed. section 3.1.1
Pair reviews with CI/CD and readable, maintainable code to reduce defects reaching production. section 1.3.1

The wrong cache

A pull request retrieves data from a cache and includes passing unit tests, but the implementation reads from the wrong cache. Review reveals the subtle functionality defect. section 3.1.1

How "Looks Good to Me" covers it

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Also explained in

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Learn AI-Assisted Python Programming, Second EditionA software bug is a defect in a program that can cause it to produce incorrect behavior or fail under particular conditions.
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Statistics Every Programmer NeedsA defect is an imperfection or nonconformity that causes a product or unit to fail a specified quality criterion.

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Related concepts

side effectincludes · A software side effect is an observable change or interaction caused by an operation beyond producing its direct result, such as modifying state or performing input or output.
flaky testincludes · A flaky test is an automated test whose outcome varies across executions under equivalent conditions without a relevant change to the software or test intent.
debuggingaddressed by · Debugging is the systematic process of investigating software behavior to locate, diagnose, and correct defects or their causes.
testaddressed by · A test is a procedure or check that evaluates behavior using specified inputs or evidence against expected results or criteria.
code reviewaddressed by · Code review is the systematic examination of source code or proposed changes to identify problems and assess or improve quality.
runtime logic errorincludes · A runtime logic error is a defect in a program’s computation or control logic that causes incorrect behavior during execution, even though the program runs.

This explainer was generated by Manning's knowledge graph from the text of "Looks Good to Me". The section links point to the parts of the book it draws on.