Value Ptr

###value & ptr

func checkValuePtr() {

one := [2]int{1, 2} // pass by value

two := one // value copy ?! what Go compiler do !?

// one[1] = 7 // or change copy
// fmt.Println(one)
// fmt.Println(two)

//fmt.Println(&one)
//fmt.Println(&two)

fmt.Println(&one[0])

fmt.Println(&two[0])

}

Result below :

[ ~/Code/git/gopher/src/hello/ ] #
[ replay | done: 18.21721ms ]
[1 7]
[1 2]
[ ~/Code/git/gopher/src/hello/ ] #
[ replay | done: 18.169683ms ]
[1 2]
[1 2]
[ ~/Code/git/gopher/src/hello/ ] #
[ replay | done: 18.309969ms ]
&[1 2]
&[1 2]
[ ~/Code/git/gopher/src/hello/ ] #
[ replay | done: 18.196578ms ]
0x11200448
0x11200450

##conclusion

• Pass by value do Copy original value ! @1
• Pass by ptr do Copy pointer but original invariable ！ @2
• @1 happened at Receiver 、 Param pass 、assignment …