go-playground

go run command compiles the code into a temporary directory, and then deletes it after the program finished. go build creates executable file, that can be used to be run later.

The Zero Value

Go has a concept of zero value. When a variable is declared, it is assigned a zero value. The zero value is:

• 0 for numeric types
• false for the boolean type
• "" for strings
• nil for interfaces, slices, channels, maps, pointers and functions

Capacity and Length

• Capacity is the total number of elements that can be stored in the slice.
• Length is the number of elements that are currently stored in the slice.