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Strings

Strings in Go are immutable sequences of bytes.

Unlike languages like Python or Java, they are not internally represented as Unicode. Consequently, when reading strings from files or network connections, there is no conversion step from bytes to internal representation. When writing strings to files, there is no conversion to a code page.

Go strings don’t assume any particular code page. They are just bytes.

Go source code files are always UTF-8 so strings defined in source code are also valid utf8 strings.

Additionally, functions in the standard library that involve converting characters to upper-case or lower-case etc. assume that raw bytes represent UTF-8-encoded Unicode strings and perform transformations using Unicode rules.

Basic string usage:

var s string // empty string ""
s1 := "string\nliteral\nwith\tescape characters"
s2 := `raw string literal
which doesn't recgonize escape characters like \n
`

// you can add strings with +
fmt.Printf("sum of string: %s\n", s+s1+s2)

// you can compare strings with ==
if s1 == s2 {
	fmt.Printf("s1 is equal to s2\n")
} else {
	fmt.Printf("s1 is not equal to s2\n")
}

fmt.Printf("substring of s1: %s\n", s1[3:5])
fmt.Printf("byte (character) at position 3 in s1: %d\n", s1[3])

// C-style string formatting
s = fmt.Sprintf("%d + %f = %s", 1, float64(3), "4")
fmt.Printf("s: %s\n", s)
sum of string: string
literal
with	escape charactersraw string literal
	which doesn't recgonize escape characters like \n
	
s1 is not equal to s2
substring of s1: in
byte (character) at position 3 in s1: 105
s: 1 + 3.000000 = 4

Important standard library packages for working on strings:

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