Useful slices for cartasian product

Author: mowshon

string.go

@@ -0,0 +1,65 @@
+package iterium
+
+// concatMultipleSlices merge more than two slices at once.
+func concatMultipleSlices[T any](slices ...[]T) (result []T) {
+	for _, s := range slices {
+		result = append(result, s...)
+	}
+
+	return result
+}
+
+// AsciiLowercase represents lower case letters.
+var AsciiLowercase = []string{
+	"a", "b", "c", "d", "e", "f", "g",
+	"h", "i", "j", "k", "l", "m", "n",
+	"o", "p", "q", "r", "s", "t", "u",
+	"v", "w", "x", "y", "z",
+}
+
+// AsciiUppercase represents upper case letters.
+var AsciiUppercase = []string{
+	"A", "B", "C", "D", "E", "F", "G",
+	"H", "I", "J", "K", "L", "M", "N",
+	"O", "P", "Q", "R", "S", "T", "U",
+	"V", "W", "X", "Y", "Z",
+}
+
+// AsciiLetters is a concatenation of AsciiLowercase and AsciiUppercase.
+var AsciiLetters = append(AsciiLowercase, AsciiUppercase...)
+
+// Digits is a slice of the digits in the string type.
+var Digits = []string{
+	"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
+}
+
+// HexDigits represents hexadecimal letters.
+var HexDigits = []string{
+	"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
+	"a", "b", "c", "d", "e", "f", "A", "B", "C", "D",
+	"E", "F",
+}
+
+// OctDigits represents octadecimal letters.
+var OctDigits = []string{
+	"0", "1", "2", "3", "4", "5", "6", "7",
+}
+
+// Punctuation is a slice of ASCII characters that
+// are considered punctuation marks in the C locale
+var Punctuation = []string{
+	"!", "\"", "#", "$", "%", "&", "'", "(",
+	")", "*", "+", ",", "-", ".", "/", ":",
+	";", "<", "=", ">", "?", "@", "[", "\\",
+	"]", "^", "_", "`", "{", "|", "}", "~",
+}
+
+// Whitespace contains all ASCII characters that are considered whitespace
+var Whitespace = []string{
+	" ", "\t", "\n", "\r", "\x0b", "\x0c",
+}
+
+// Printable is a slice of ASCII characters which are considered printable.
+var Printable = concatMultipleSlices(
+	AsciiLetters, Digits, Punctuation, Whitespace,
+)