added "^" reporter (power of) in the Operators category

HISTORY.md

@@ -14,11 +14,12 @@
     * new "play frequency" command in the Sound category
     * blocks for changing and querying the "flat line ends" setting 
     * selectors for changing and querying "draggable" and "rotation style" settings
+    * added "neg" selector to monadic function reporter in "Operators" category
+    * added "^" reporter (power of) in the Operators category
     * special context-aware drop-downs for custom blocks
     * new "stick to" submenu in the sprite context menu where applicable
     * multi-line and monospaced "code" input slots for custom blocks
     * new "string" library, thanks, Brian
-    * added "neg" selector to monadic function reporter in "Operators" category
     * new "text costumes" library for generating costumes from letters or words of text
     * enhanced support for embedding Snap in other website, thanks, Bernat!
     * export sounds

src/objects.js

@@ -948,6 +948,11 @@ SpriteMorph.prototype.initBlocks = function () {
             spec: '%fun of %n',
             defaults: [null, 10]
         },
+        reportPower: {
+            type: 'reporter',
+            category: 'operators',
+            spec: '%n ^ %n'
+        },
         reportModulus: {
             type: 'reporter',
             category: 'operators',
@@ -2106,6 +2111,7 @@ SpriteMorph.prototype.blockTemplates = function (category) {
         blocks.push(block('reportDifference'));
         blocks.push(block('reportProduct'));
         blocks.push(block('reportQuotient'));
+        blocks.push(block('reportPower'));
         blocks.push('-');
         blocks.push(block('reportModulus'));
         blocks.push(block('reportRound'));
@@ -2958,6 +2964,7 @@ SpriteMorph.prototype.reporterize = function (expressionString) {
             '*': 'reportProduct',
             '/': 'reportQuotient',
             '%': 'reportModulus',
+            '^': 'reportPower',
             '=': 'reportEquals',
             '<': 'reportLessThan',
             '>': 'reportGreaterThan',
@@ -7351,6 +7358,7 @@ StageMorph.prototype.blockTemplates = function (category) {
         blocks.push(block('reportDifference'));
         blocks.push(block('reportProduct'));
         blocks.push(block('reportQuotient'));
+        blocks.push(block('reportPower'));
         blocks.push('-');
         blocks.push(block('reportModulus'));
         blocks.push(block('reportRound'));

src/threads.js

@@ -2564,6 +2564,10 @@ Process.prototype.reportQuotient = function (a, b) {
     return +a / +b;
 };
 
+Process.prototype.reportPower = function (a, b) {
+    return Math.pow(+a, +b);
+};
+
 Process.prototype.reportModulus = function (a, b) {
     var x = +a,
         y = +b;