fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
go/ast | Package ast declares the types used to represent syntax trees for Go packages. |
go/parser | Package parser implements a parser for Go source files. |
go/token | Package token defines constants representing the lexical tokens of the Go programming language and basic operations on tokens (printing, predicates). |
os | Package os provides a platform-independent interface to operating system functionality. |
path | Package path implements utility routines for manipulating slash-separated paths. |
path/filepath | Package filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths. |
reflect | Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types. |
regexp | Package regexp implements regular expression search. |
sort | Package sort provides primitives for sorting slices and user-defined collections. |
strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |