Just another update

Task/Literals-String/00DESCRIPTION

@@ -1,3 +1,5 @@
-Show literal specification of characters and strings. If supported, show how verbatim strings (quotes where escape sequences are quoted literally) and here-strings work. Also, discuss which quotes expand variables.
+Show literal specification of characters and strings.
+If supported, show how verbatim strings (quotes where escape sequences are quoted literally) and here-strings work.
+Also, discuss which quotes expand variables.
 
 * Related tasks: [[Special characters]], [[Here document]]

Task/Literals-String/00META.yaml

@@ -1,2 +1,5 @@
 ---
+category:
+- String manipulation
+- Syntax elements
 note: Basic language learning

Task/Literals-String/Emacs-Lisp/literals-string-1.l

@@ -0,0 +1 @@
+"This is a string."

Task/Literals-String/Emacs-Lisp/literals-string-2.l

@@ -0,0 +1,2 @@
+?z    => 122
+?\n   => 10

Task/Literals-String/Go/literals-string-1.go

@@ -1 +1,6 @@
 ch := 'z'
+ch = 122          // or 0x7a or 0172 or any other integer literal
+ch = '\x7a'       // \x{2*hex}
+ch = '\u007a'     // \u{4*hex}
+ch = '\U0000007a' // \U{8*hex}
+ch = '\172'       // \{3*octal}

Task/Literals-String/Go/literals-string-2.go

@@ -1,6 +1,14 @@
-ch := 'z'          // by default, ch takes type int32
-var r rune = 'z'   // reflect.TypeOf(r) still returns int32
-var b byte = 'z'   // reflect.TypeOf(b) returns uint8
+ch := 'z'          // ch is type rune (an int32 type)
+var r rune = 'z'   // r is type rune
+var b byte = 'z'   // b is type byte (an uint8 type)
 b2 := byte('z')    // equivalent to b
-const c byte = 'z' // c is now a "typed constant"
+const z = 'z'      // z is untyped, it may be freely assigned or used in any integer expression
+b = z
+r = z
+ch2 := z           // equivalent to ch (type rune)
+var i int = z
+const c byte = 'z' // c is a typed constant
+b = c
+r = rune(c)
+i = int(c)
 b3 := c            // equivalent to b

Task/Literals-String/Go/literals-string-3.go

@@ -1 +1,3 @@
 str := "z"
+str = "\u007a"
+str = "two\nlines"

Task/Literals-String/Go/literals-string-6.go

@@ -1,2 +1,2 @@
 `abc
-def` == "abc\ndef"
+def` == "abc\ndef", // never "abc\r\ndef" even if the source file contains CR+LF line endings

Task/Literals-String/REXX/literals-string-3.rexx

@@ -1,16 +1,7 @@
-It's also possible to express characters in hexadecimal notation in a string:
 lf = '0A'x
 cr = '0D'x
 
-mmm='01 02 03 34 ee'x
-ppp='dead beaf 11112222 33334444 55556666 77778888 00009999 c0ffee'X
+mmm = '01 02 03 34 ee'x
+ppp = 'dead beaf 11112222 33334444 55556666 77778888 00009999 c0ffee'X
 
-lang='52455858'x     /*which is "REXX" on ASCII-computers.*/
-
-Binary strings are also possible:
-
-jjj='01011011'B
-jjj='01011011'b
-jjj="0101 1011"b
-jjj='0101 1011 1111'b
-longjjj='11110000 10100001 10110010 11100011 11100100'B
+lang = '52455858'x     /*which is "REXX" on ASCII-computers.*/

Task/Literals-String/REXX/literals-string-4.rexx

@@ -0,0 +1,5 @@
+jjj = '01011011'B
+jjj = '01011011'b
+jjj = "0101 1011"b
+jjj = '0101 1011 1111'b
+longjjj = '11110000 10100001 10110010 11100011 11100100'B