Rot-13: Difference between revisions

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 =={{header|D}}==
+===Using Standard Functions===
-{{works with|D|2}}
+<lang d>import std.stdio;
+import std.ascii: letters, U = uppercase, L = lowercase;
+import std.string: maketrans, translate;
+immutable r13 = maketrans(letters,
+                          //U[13 .. $] ~ U[0 .. 13] ~
+                          U[13 .. U.length] ~ U[0 .. 13] ~
+                          L[13 .. L.length] ~ L[0 .. 13]);
+void main() {
+    writeln("This is the 1st test!".translate(r13, null));
+}</lang>
+Output:
+<pre>The Quick Brown Fox Jumps Over The Lazy Dog!</pre>
+===Imperative Implementation===
 <lang d>import std.stdio, std.traits, std.ascii, std.range, std.conv;
-S rot13(S)(in S s) if (isSomeString!S) {
-    return rot(s, 13);
-}
 S rot(S)(in S s, in int key) if (isSomeString!S) {
     auto r = new dchar[s.walkLength];
-    foreach (i, dchar c; s) {
+    foreach (i, const dchar c; s) {
-        if (std.ascii.isLower(c))
+        if (c.isLower())
-            c = ((c - 'a' + key) % 26 + 'a');
+            r[i] = ((c - 'a' + key) % 26 + 'a');
-        else if (std.ascii.isUpper(c))
+        else if (c.isUpper())
-            c = ((c - 'A' + key) % 26 + 'A');
+            r[i] = ((c - 'A' + key) % 26 + 'A');
-        r[i] = c;
+        else
+            r[i] = c;
     }
     return to!S(r);
+}
+S rot13(S)(in S s) if (isSomeString!S) {
+    return rot(s, 13);
 }
 void main() {
-    writeln("Gur Dhvpx Oebja Sbk Whzcf Bire Gur Ynml Qbt!".rot13());
+    "Gur Dhvpx Oebja Sbk Whzcf Bire Gur Ynml Qbt!".rot13().writeln();
-}</lang>
-Output:
-<pre>The Quick Brown Fox Jumps Over The Lazy Dog!</pre>
-{{works with|D|1}}
-<lang d>import std.stdio, std.string;
-void main() {
-    auto r13 = letters.maketrans(uppercase[13..$] ~ uppercase[0..13] ~
-                                 lowercase[13..$] ~ lowercase[0..13]);
-    writefln("This is the 1st test!".translate(r13, null));
 }</lang>