fcnv

fcnv provides Go with fast and easy type conversion.

Conversion table

func	from	to
Atoi	string	int
Atoi8		int8
Atoi16		int16
Atoi32		int32
Atoi64		int64
Atoui		uint
Atoui8		uint8
Atoui16		uint16
Atoui32		uint32
Atoui64		uint64
Atof32		float32
Atof64		float64
Atoc64		complex64
Atoc128		comlex128
Atob		[]byte
Itoa	int, int8, int16, int32, int64	string
Uitoa	uint, uint8, uint16, uint32, uint64
Ctoa	complex64, complex128
Ftoa	float32, float64
Btoa	[]byte
Byte2Int	[]byte	int
Int2Byte	int	[]byte
Byte2Bool	[]byte	bool
Bool2Byte	bool	[]byte
Bool2Int	bool	int
Int2Bool	int	bool
Bool2Uint	bool	uint
Uint2Bool	uint	bool
Bool2Str	bool	string
Str2Bool	string	bool
Struct2Json	interface{}	string
Datetime2Date	time.Time	time.Time
Hankaku2Zenkaku	string	string
Zenkaku2Hankaku	string	string
Struct2FlatMap	struct	1-Lv. map[string]string
FlatMap2Struct	1-Lv. map[string]string	struct

Benchmark

Atoi* / Atoui*

• old: BenchmarkAto(|u)i\d?ByParse(I|Ui)nt
• new: BenchmarkNewAto(|u)i\d?

name          old time/op     new time/op    delta
Atoi-12       29.5ns ± 4%    22.9ns ± 4%  -22.23%  (p=0.000 n=72+76)
Atoi8-12      26.0ns ± 6%    20.5ns ±10%  -21.22%  (p=0.000 n=78+77)
Atoi16-12     25.3ns ± 5%    20.9ns ± 8%  -17.37%  (p=0.000 n=78+73)
Atoi32-12     25.7ns ± 9%    21.3ns ± 9%  -17.30%  (p=0.000 n=71+68)
Atoi64-12     28.9ns ± 6%    25.0ns ± 9%  -13.30%  (p=0.000 n=75+77)
Atoui-12      37.4ns ± 3%    33.2ns ± 5%  -11.23%  (p=0.000 n=67+70)
Atoui8-12     24.3ns ±12%    23.1ns ±13%   -4.92%  (p=0.000 n=72+76)
Atoui16-12    24.3ns ± 7%    22.8ns ±10%   -6.00%  (p=0.000 n=72+70)
Atoui32-12    23.5ns ± 3%    17.6ns ± 6%  -25.09%  (p=0.000 n=72+73)
Atoui64-12    25.9ns ± 7%    22.4ns ± 7%  -13.55%  (p=0.000 n=72+73)

name          old alloc/op    new alloc/op   delta
Atoi-12        2.00B ± 0%     2.00B ± 0%     ~     (all equal)
Atoi8-12       9.00B ± 0%     9.00B ± 0%     ~     (all equal)
Atoi16-12      6.00B ± 0%     6.00B ± 0%     ~     (all equal)
Atoi32-12      4.00B ± 0%     3.61B ±17%   -9.69%  (p=0.000 n=80+80)
Atoi64-12      2.00B ± 0%     2.00B ± 0%     ~     (all equal)
Atoui-12       8.00B ± 0%     8.00B ± 0%     ~     (all equal)
Atoui8-12      16.0B ± 0%     16.0B ± 0%     ~     (all equal)
Atoui16-12     12.0B ± 0%     12.0B ± 0%     ~     (all equal)
Atoui32-12     7.00B ± 0%     3.00B ± 0%  -57.14%  (p=0.000 n=80+80)
Atoui64-12     4.00B ± 0%     4.00B ± 0%     ~     (all equal)

name          old allocs/op   new allocs/op  delta
Atoi-12          0.00            0.00          ~     (all equal)
Atoi8-12         0.00            0.00          ~     (all equal)
Atoi16-12        0.00            0.00          ~     (all equal)
Atoi32-12        0.00            0.00          ~     (all equal)
Atoi64-12        0.00            0.00          ~     (all equal)
Atoui-12         0.00            0.00          ~     (all equal)
Atoui8-12        0.00            0.00          ~     (all equal)
Atoui16-12       0.00            0.00          ~     (all equal)
Atoui32-12       0.00            0.00          ~     (all equal)
Atoui64-12       0.00            0.00          ~     (all equal)

Atob / Btoa

• old: BenchmarkCast(Atob|Btoa)
• new: BenchmarkNew(Atob|Btoa)

name     old time/op    new time/op    delta
Atob-12    0.48ns ± 3%    0.24ns ± 8%  -49.24%  (p=0.000 n=88+90)
Btoa-12    3.66ns ±11%    0.24ns ± 0%  -93.44%  (p=0.000 n=92+68)

name     old alloc/op   new alloc/op   delta
Atob-12     0.00B          0.00B          ~     (all equal)
Btoa-12     0.00B          0.00B          ~     (all equal)

name     old allocs/op  new allocs/op  delta
Atob-12      0.00           0.00          ~     (all equal)
Btoa-12      0.00           0.00          ~     (all equal)

test

$ go test -bench Ato -o test.bin -cpuprofile=cpu.prof -benchmem -count 100 -short -timeout 60m | tee run.log
$ # go install golang.org/x/perf/cmd/benchstat@latest
$ benchstat run.log
$ pprof -http=":8888" test.bin cpu.prof