How to debug the func of makeSlice Or the map creating or growing process step by step

[Chai Baoyang]

Hi All,

       I want to know how the slice or map grow.

       Do we have an method to debug the func of  makeSlice Or the map creating or growing process step by step?

[Brian Candler]

To grow a slice, as a programmer you would do:

    myslice = append(myslice, value)

    myslice = append(myslice, anotherslice...)

Or you can do this my hand, by allocating a new slice of the required size, and copying the elements you want to keep.

There is a great overview of how this works internally at https://blog.golang.org/slices

Also interesting: https://github.com/golang/go/wiki/SliceTricks

To grow a map you just set a key to a value.  There is outline information here: https://blog.golang.org/maps

I'm sure I read an article which went into detail about the hashing algorithm, and under what conditions the hash grows, but I can't find it now.

The details are of course in the source code:

https://github.com/golang/go/blob/master/src/runtime/map.go