Go - Boolean and Strings

Boolean

• bool
• boolean

Strings

• Conventionally UTF-8
• Built-in function len returns the number of bytes, not runes in a string
• Detect length of string
• Convert to []rune and use len()
• Use unicode/utf8
  
• substring, format: string[startIdx:endIdx], need to be reminded you need cast to rune if string contains 
• Can use + to a append string. 
  
• Use == or > or < to compare string byte by byte (natural lexicographic ordering)
  
• string is immutable, so you CAN NOT assign value to a char of a string
  
• Natural data type to hold a single rune is int32
• UTF8
• UTF8 is a variable-length encoding of unicode code points as byte.
• High order bits of the first byte of the encoding for a rune indicate how many bytes follow. 
• You can search for rune by searching for its bytes without worrying about the preceding context
• Lexicographic order equals to unicode point order. So sort UTF8 works naturally
• Go files always encoded in UTF8
• For special character. Use \uhhhh for 16 bits value. Usev\Uhhhhhhhh for 32 bits value
• Can use ==, <, > ...etc to compare string
  
• Count characters
• utf8.RuneCountInString and utf8.DecodeRuneInString
  
• Range byte array