How to avoid Go gotchas
[Pages:78]How to avoid Go gotchas
by learning internals
Ivan Danyliuk, Golang BCN meetup 2 Nov 2016
Gotchas
? Go has some gotchas ? Good examples:
? 50 Shades of Go: Traps, Gotchas, and Common Mistakes for New Golang Devs
? Go Traps ? Golang slice append gotcha
Gotchas
? Luckily, Go has very few gotchas ? Especially in comparison with other languages
Go C++
0
75
150
225
300
Gotchas
? So, what is gotcha? ? "a gotcha is a valid construct in a system, program or
programming language that works as documented but is counterintuitive and almost invites mistakes because it is both easy to invoke and unexpected or unreasonable in its outcome"
Gotchas
? Two solutions: ? "fix" the language ? fix the intuition.
? Let's build some intuition to fight gotchas then.
Gotchas
? Let's learn some internals and in memory representations ? It worked for me, should work for you as well.
basic types
Code:
i := 1234 j := int32(4) i64 := int64(999) f := float32(3.14)
basic types
Code:
i
i := 1234
j := int32(4)
1234
i64 := int64(999)
int
f := float32(3.14)
i64
999
int64
j
4
int32
f
3.14
float32
................
................
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