History variables: Difference between revisions

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 -Jan-19 23:04:55.1662596; goodby
 </pre>
 =={{header|EchoLisp}}==
 No native support. We implement an anonymous stack associated with the variable, and a few syntax rules to define the needed operations.
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 (h-undo x) → ❌ error: no more values x
 </lang>
 =={{header|Elena}}==
 ELENA 5.0 :
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 </pre>
 =={{header|Julia}}==
 Julia currently does not support overloading the assignment "=" operator.
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 undo 3, current value: a
 $x is: a</lang>
-=={{header|Perl 6}}==
-{{works with|Rakudo|2018.03}}
-<lang perl6>class HistoryVar {
-    has @.history;
-    has $!var handles <Str gist FETCH Numeric>;
-    method STORE($val) is rw {
-        push @.history, [now, $!var];
-        $!var = $val;
-    }
-}
-my \foo = HistoryVar.new;
-foo = 1;
-foo = 2;
-foo += 3;
-foo = 42;
-.say for foo.history;
-say "Current value: {foo}";</lang>
-{{out}}
-<pre>[Instant:1523396079.685629 (Any)]
-[Instant:1523396079.686844 1]
-[Instant:1523396079.687130 2]
-[Instant:1523396079.687302 5]
-Current value: 42
-</pre>
 =={{header|Phix}}==
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 (check-equal? (hvar-current hv) 0)
 </lang>
+=={{header|Raku}}==
+(formerly Perl 6)
+{{works with|Rakudo|2018.03}}
+<lang perl6>class HistoryVar {
+    has @.history;
+    has $!var handles <Str gist FETCH Numeric>;
+    method STORE($val) is rw {
+        push @.history, [now, $!var];
+        $!var = $val;
+    }
+}
+my \foo = HistoryVar.new;
+foo = 1;
+foo = 2;
+foo += 3;
+foo = 42;
+.say for foo.history;
+say "Current value: {foo}";</lang>
+{{out}}
+<pre>[Instant:1523396079.685629 (Any)]
+[Instant:1523396079.686844 1]
+[Instant:1523396079.687130 2]
+[Instant:1523396079.687302 5]
+Current value: 42
+</pre>
 =={{header|REXX}}==
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 x history.
 </lang>
 =={{header|Swift}}==
 Swift does not support history variables. However, you can add a watcher that can track when the variable will change.