Golang playground

along with some notes

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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.

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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)

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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