『100 Go Mistakes and How to Avoid Them』を読む

『100 Go Mistakes and How to Avoid Them』を読む

01#1: Unintended variable shadowing を読む 02#2: Unnecessary nested code を読む 03#3: Misusing init functions を読む 04#4: Overusing getters and setters を読む 05#5: Interface pollution を読む 06#6: Interface on the producer side を読む 07#7: Returning interfaces を読む 08#8: any says nothing を読む 09#9: Being confused about when to use generics を読む 10#10: Not being aware of the possible problems with type embedding を読む 11#11: Not using the functional options pattern を読む 12#12: Project misorganization を読む 13#13: Creating utility packages を読む 14#14: Ignoring package name collisions を読む 15#15: Missing code documentation を読む 16#16: Not using linters を読む 17#17: Creating confusion with octal literals を読む 18#18: Neglecting integer overflows を読む 19#19: Not understanding floating points を読む 20#20: Not understanding slice length and capacity を読む 21#21: Inefficient slice initialization を読む 22#22: Being confused about nil vs. empty slices を読む 23#23: Not properly checking if a slice is empty を読む 24#24: Not making slice copies correctly を読む 25#25: Unexpected side effects using slice append を読む 26#26: Slices and memory leaks を読む 27#27: Inefficient map initialization を読む 28#28: Maps and memory leaks を読む 29#29: Comparing values incorrectly を読む 30#30: Ignoring the fact that elements are copied in range loops を読む 31#31: Ignoring how arguments are evaluated in range loops を読む 32#32: Ignoring the impact of using pointer elements in range loops を読む 33#33: Making wrong assumptions during map iterations を読む 34#34: Ignoring how the break statement works を読む 35#35: Using defer inside a loop を読む 36#36: Not understanding the concept of a rune を読む 37#37: Inaccurate string iteration を読む 38#38: Misusing trim functions を読む 39#39: Under-optimized string concatenation を読む 40#40: Useless string conversions を読む 41#41: Substrings and memory leaks を読む 42#42: Not knowing which type of receiver to use を読む 43#43: Never using named result parameters を読む 44#44: Unintended side effects with named result parameters を読む 45#45: Returning a nil receiver を読む 46#46: Using a filename as a function input を読む 47#47: Ignoring how defer arguments and receivers are evaluated を読む 48#48: Panicking を読む 49#49: Ignoring when to wrap an error を読む 50#50: Checking an error type inaccurately を読む 51#51: Checking an error value inaccurately を読む 52#52: Handling an error twice を読む 53#53: Not handling an error を読む 54#54: Not handling defer errors を読む 55#55: Mixing up concurrency and parallelism を読む 56#56: Thinking concurrency is always faster を読む 57#57: Being puzzled about when to use channels or mutexes を読む 58#58: Not understanding race problems を読む 59#59: Not understanding the concurrency impacts of a workload type を読む 60#60: Misunderstanding Go contexts を読む 61#61: Propagating an inappropriate context を読む 62#62: Starting a goroutine without knowing when to stop it を読む 63#63: Not being careful with goroutines and loop variables を読む 64#64: Expecting deterministic behavior using select and channels を読む 65#65: Not using notification channels を読む 66#66: Not using nil channels を読む 67#67: Being puzzled about channel size を読む 68#68: Forgetting about possible side effects with string formatting を読む 69#69 Creating data races with append を読む 70#70 Using mutexes inaccurately with slices and maps を読む 71#71 Misusing sync.WaitGroup を読む 72#72 Forgetting about sync.Cond を読む 73#73 Not using errgroup を読む 74#74 Copying a sync type を読む 75#75 Providing a wrong time duration を読む 76#76 time.After and memory leaks を読む 77#77 JSON handling common mistakes を読む 78#78 Common SQL mistakes を読む 79#79 Not closing transient resources を読む 80#80 Forgetting the return statement after replying to an HTTP request 81#81 Using the default HTTP client and server を読む 82#82 Not categorizing tests を読む 83#83 Not enabling the race flag を読む 84#84 Not using test execution modes を読む 85#85 Not using table-driven tests を読む 86#86 Sleeping in unit tests を読む 87#87 Not dealing with the time API efficiently を読む 88#88 Not using testing utility packages を読む 89#89 Writing inaccurate benchmarks を読む 90#90 Not exploring all the Go testing features を読む 91#91 Not understanding CPU caches を読む 92#92 Writing concurrent code that leads to false sharing を読む 93#93 Not taking into account instruction-level parallelism を読む 94#94 Not being aware of data alignment を読む 95#95 Not understanding stack vs. heap を読む 96#96 Not knowing how to reduce allocations を読む 97#97 Not relying on inlining を読む 98#98 Not using Go diagnostics tooling を読む 99#99 Not understanding how the GC works を読む 100#100 Not understanding the impacts of running Go in Docker and Kuberne

Chapter 39

#39: Under-optimized string concatenation を読む

Yuki Bobier Koshimizu

2023.04.25に更新