fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
sort | Package sort provides primitives for sorting slices and user-defined collections. |
strconv | Package strconv implements conversions to and from string representations of basic data types. |
sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
sync/atomic | Package atomic provides low-level atomic memory primitives useful for implementing synchronization algorithms. |
unicode | Package unicode provides data and functions to test some properties of Unicode code points. |
unicode/utf8 | Package utf8 implements functions and constants to support text encoded in UTF-8. |