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Task/Sierpinski-triangle/JavaScript/sierpinski-triangle.js

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+function triangle(o) {
+  var n = 1<<o, line = new Array(2*n), i,j,t,u;
+  for (i=0; i<line.length; ++i) line[i] = '&nbsp;';
+  line[n] = '*';
+  for (i=0; i<n; ++i) {
+    document.write(line.join('')+"\n");
+    u ='*';
+    for(j=n-i; j<n+i+1; ++j) {
+      t = (line[j-1] == line[j+1] ? '&nbsp;' : '*');
+      line[j-1] = u;
+      u = t;
+    }
+    line[n+i] = t;
+    line[n+i+1] = '*';
+  }
+}
+document.write("<pre>\n");
+triangle(6);
+document.write("</pre>");