September 2017 Update

Task/Floyds-triangle/JavaScript/floyds-triangle-3.js

@@ -0,0 +1,36 @@
+#!/usr/bin/env js
+
+function main() {
+    print('Floyd 5:');
+    floyd(5);
+    print('\nFloyd 14:');
+    floyd(14);
+}
+
+
+function padLeft(s, w) {
+    for (s = String(s); s.length < w; s = ' ' + s);
+    return s;
+}
+
+
+function floyd(nRows) {
+    var lowerLeft = nRows * (nRows - 1) / 2 + 1;
+    var lowerRight = nRows * (nRows + 1) / 2;
+
+    var colWidths = [];
+    for (var col = lowerLeft; col <= lowerRight; col++) {
+        colWidths.push(String(col).length);
+    }
+
+    var  num = 1;
+    for (var row = 0; row < nRows; row++) {
+        var line = [];
+        for (var col = 0; col <= row; col++, num++) {
+            line.push(padLeft(num, colWidths[col]));
+        }
+        print(line.join(' '));
+    }
+}
+
+main();