go 1.17
normal_int,str
array
slice
map
string and string_func
cat /igo/0209/intstr_test.go
package type_test
import "testing"
type MyInt int64
func TestImplicit(t *testing.T) {
var a int32 = 1
var b int64
b = int64(a)
var c MyInt
c = MyInt(b)
t.Log(a, b, c)
}
func TestPoint(t *testing.T) {
a := 1
aPtr := &a
// & 取指符，获得变量a的指针
//aPtr = aPtr + 1
t.Log(a, aPtr)
t.Logf("%T %T", a, aPtr)
}
func TestString(t *testing.T) {
var s string
t.Log("*" + s + "*") //初始化零值是“”
t.Log(len(s))
}
******************运行结果分隔符**********************
=== RUN TestPoint
noramltype_test.go:9: 1 0xc00000a248
noramltype_test.go:10: int *int
--- PASS: TestPoint (0.00s)
=== RUN TestString
noramltype_test.go:15: **
noramltype_test.go:16: 0
--- PASS: TestString (0.00s)
******************运行结果分隔符**********************
cat /igo/0209/array_test.go
package array_test
import "testing"
func TestArrayInit(t *testing.T) {
var arr [3]int
arr1 := [4]int{1, 2, 3, 4}
arr3 := [...]int{1, 3, 4, 5}
arr1[1] = 5
t.Log(arr[1], arr[2])
t.Log(arr1, arr3)
}
func TestArrayTravel(t *testing.T) {
arr3 := [...]int{1, 3, 4, 5}
for i := 0; i < len(arr3); i++ {
t.Log(arr3[i])
}
for _, e := range arr3 {
t.Log(e)
}
}
func TestArraySection(t *testing.T) {
arr3 := [...]int{1, 2, 3, 4, 5}
arr3_sec := arr3[:]
t.Log(arr3_sec)
}cat /igo/0209/slice_test.go
slice 相当于指针数组
package slice_test
import "testing"
func TestSliceInit(t *testing.T) {
var s0 []int
t.Log(len(s0), cap(s0))
s0 = append(s0, 1)
t.Log(len(s0), cap(s0))
s1 := []int{1, 2, 3, 4}
t.Log(len(s1), cap(s1))
s2 := make([]int, 3, 5)
t.Log(len(s2), cap(s2))
t.Log(s2[0], s2[1], s2[2])
s2 = append(s2, 1)
t.Log(s2[0], s2[1], s2[2], s2[3])
t.Log(len(s2), cap(s2))
}
func TestSliceGrowing(t *testing.T) {
s := []int{}
for i := 0; i < 10; i++ {
s = append(s, i)
t.Log(len(s), cap(s))
}
}
func TestSliceShareMemory(t *testing.T) {
year := []string{"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
"Oct", "Nov", "Dec"}
Q2 := year[3:6]
t.Log(Q2, len(Q2), cap(Q2))
summer := year[5:8]
t.Log(summer, len(summer), cap(summer))
summer[0] = "Unknow"
t.Log(Q2)
t.Log(year)
}
func TestSliceComparing(t *testing.T) {
a := []int{1, 2, 3, 4}
b := []int{1, 2, 3, 4}
// if a == b { //切片只能和nil比较
// t.Log("equal")
// }
t.Log(a, b)
}
go_slice 结果
GOROOT=/usr/local/go #gosetup
GOPATH=/Users/igo/go #gosetup
/usr/local/go/bin/go test -c -o /private/var/folders/0p/379lx5z921lcvpmc7k59c6f40000gn/T/GoLand/___slice_test_go.test go/test #gosetup
/usr/local/go/bin/go tool test2json -t /private/var/folders/0p/379lx5z921lcvpmc7k59c6f40000gn/T/GoLand/___slice_test_go.test -test.v -test.paniconexit0 -test.run ^\QTestSliceInit\E|\QTestSliceGrowing\E|\QTestSliceShareMemory\E|\QTestSliceComparing\E$
=== RUN TestSliceInit
slice_test.go:7: 0 0
slice_test.go:9: 1 1
slice_test.go:12: 4 4
slice_test.go:15: 3 5
slice_test.go:16: 0 0 0
slice_test.go:18: 0 0 0 1
slice_test.go:19: 4 5
--- PASS: TestSliceInit (0.00s)
=== RUN TestSliceGrowing
slice_test.go:26: 1 1
slice_test.go:26: 2 2
slice_test.go:26: 3 4
slice_test.go:26: 4 4
slice_test.go:26: 5 8
slice_test.go:26: 6 8
slice_test.go:26: 7 8
slice_test.go:26: 8 8
slice_test.go:26: 9 16
slice_test.go:26: 10 16
--- PASS: TestSliceGrowing (0.00s)
=== RUN TestSliceShareMemory
slice_test.go:34: [Apr May Jun] 3 9
slice_test.go:36: [Jun Jul Aug] 3 7
slice_test.go:38: [Apr May Unknow]
slice_test.go:39: [Jan Feb Mar Apr May Unknow Jul Aug Sep Oct Nov Dec]
--- PASS: TestSliceShareMemory (0.00s)
=== RUN TestSliceComparing
slice_test.go:48: [1 2 3 4] [1 2 3 4]
--- PASS: TestSliceComparing (0.00s)
PASS
Process finished with the exit code 0
cat /igo/0209/map_test.go
package my_map
import "testing"
func TestInitMap(t *testing.T) {
m1 := map[int]int{1: 1, 2: 4, 3: 9}
t.Log(m1[2])
t.Logf("len m1=%d", len(m1))
m2 := map[int]int{}
m2[4] = 16
t.Logf("len m2=%d", len(m2))
m3 := make(map[int]int, 10)
t.Logf("len m3=%d", len(m3))
}
func TestAccessNotExistingKey(t *testing.T) {
m1 := map[int]int{}
t.Log(m1[1])
m1[2] = 0
t.Log(m1[2])
m1[3] = 0
if v, ok := m1[3]; ok {
t.Logf("Key 3's value is %d", v)
} else {
t.Log("key 3 is not existing.")
}
}
func TestTravelMap(t *testing.T) {
m1 := map[int]int{1: 1, 2: 4, 3: 9}
for k, v := range m1 {
t.Log(k, v)
}
}
cat map_ext_test.go
package map_ext
import "testing"
func TestMapWithFunValue(t *testing.T) {
m := map[int]func(op int) int{}
m[1] = func(op int) int { return op }
m[2] = func(op int) int { return op * op }
m[3] = func(op int) int { return op * op * op }
t.Log(m[1](2), m[2](2), m[3](2))
}
func TestMapForSet(t *testing.T) {
mySet := map[int]bool{}
mySet[1] = true
n := 3
if mySet[n] {
t.Logf("%d is existing", n)
} else {
t.Logf("%d is not existing", n)
}
mySet[3] = true
t.Log(len(mySet))
delete(mySet, 1)
n = 1
if mySet[n] {
t.Logf("%d is existing", n)
} else {
t.Logf("%d is not existing", n)
}
}cat string_test.go
package string_test
import (
"testing"
)
func TestString(t *testing.T) {
var s string
t.Log(s) //初始化为默认零值“”
s = "hello"
t.Log(len(s))
//s[1] = '3' //string是不可变的byte slice
//s = "\xE4\xB8\xA5" //可以存储任何二进制数据
s = "\xE4\xBA\xBB\xFF"
t.Log(s)
t.Log(len(s))
s = "中"
t.Log(len(s)) //是byte数
c := []rune(s)
t.Log(len(c))
// t.Log("rune size:", unsafe.Sizeof(c[0]))
t.Logf("中 unicode %x", c[0])
t.Logf("中 UTF8 %x", s)
}
func TestStringToRune(t *testing.T) {
s := "中华人民共和国"
for _, c := range s {
t.Logf("%[1]c %[1]x", c)
}
}
cat string_fun_test.go
package string_test
import (
"strconv"
"strings"
"testing"
)
func TestStringFn(t *testing.T) {
s := "A,B,C"
parts := strings.Split(s, ",")
for _, part := range parts {
t.Log(part)
}
t.Log(strings.Join(parts, "-"))
}
func TestConv(t *testing.T) {
s := strconv.Itoa(10)
t.Log("str" + s)
if i, err := strconv.Atoi("10"); err == nil {
t.Log(10 + i)
}
}