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Golang playground

along with some notes

Data types

  • bool: Boolean type representing true or false values.
  • string: Represents a sequence of characters.
  • int: Signed integer type, its size varies depending on the platform.
  • int8: 8-bit signed integer.
  • int16: 16-bit signed integer.
  • int32: 32-bit signed integer.
  • int64: 64-bit signed integer.
  • uint: Unsigned integer type, its size varies depending on the platform.
  • uint8: 8-bit unsigned integer (byte).
  • uint16: 16-bit unsigned integer.
  • uint32: 32-bit unsigned integer.
  • uint64: 64-bit unsigned integer.
  • uintptr: An unsigned integer type that is large enough to store the uninterpreted bits of a pointer value.
  • float32: 32-bit floating-point number.
  • float64: 64-bit floating-point number.
  • complex64: Complex number with float32 real and imaginary parts.
  • complex128: Complex number with float64 real and imaginary parts.
  • byte: Synonym for uint8, often used in Go for ASCII characters.
  • rune: Synonym for int32, represents a Unicode code point.
  • error: Represents an error condition, commonly returned by functions indicating an error state.
  • pointer: Represents the memory address of a variable.
  • array: Fixed-size collection of elements of the same type.
  • slice: Dynamically-sized, flexible view into elements of an array.
  • map: Unordered collection of key-value pairs.
  • struct: Composite data type consisting of fields with their own data types.
  • interface: Defines a set of method signatures that a type must implement to satisfy the interface.
  • channel: Concurrent communication primitive used to synchronize and communicate between goroutines.

Format specifiers

Format Specifier Data Type Represented
%d Signed integer (int, int8, int16, int32, int64)
%b Binary representation of an integer
%o Octal representation of an integer
%x, %X Hexadecimal representation of an integer
%f Floating-point number (float32, float64)
%e, %E Floating-point number in scientific notation
%g, %G Floating-point number in decimal or scientific notation
%t Boolean value (true or false)
%c Single Unicode character
%s String
%q Double-quoted string safely escaped with Go syntax
%p Pointer (displays the base 16 representation of the value)

Working with Strings package

Method Description Signature
Contains Reports whether substr is within s. Contains(s, substr string) bool
Count Counts the number of non-overlapping instances of substr in s. Count(s, substr string) int
Index Returns the index of the first instance of substr in s, or -1 if substr is not present. Index(s, substr string) int
LastIndex Returns the index of the last instance of substr in s, or -1 if substr is not present. LastIndex(s, substr string) int
Replace Returns a copy of s with the first n non-overlapping instances of old replaced by new. Replace(s, old, new string, n int) string
Split Splits s into substrings separated by sep and returns a slice of the substrings. Split(s, sep string) []string
ToLower Returns a copy of the string s with all Unicode letters mapped to their lower case. ToLower(s string) string
ToUpper Returns a copy of the string s with all Unicode letters mapped to their upper case. ToUpper(s string) string
Trim Returns a slice of the string s with all leading and trailing Unicode code points contained in cutset removed. Trim(s string, cutset string) string
TrimLeft Returns a slice of the string s with all leading Unicode code points contained in cutset removed. TrimLeft(s string, cutset string) string
TrimRight Returns a slice of the string s with all trailing Unicode code points contained in cutset removed. TrimRight(s string, cutset string) string