Another update from ingydotnet^djgoku

Task/Pascals-triangle/JavaScript/pascals-triangle-2.js

@@ -0,0 +1,72 @@
+(function (n) {
+
+  // A Pascal triangle of n rows
+  // n --> [[n]]
+  function pascalTriangle(n) {
+
+    // Sums of each consecutive pair of numbers
+    // [n] --> [n]
+    function pairSums(lst) {
+      return lst.reduce(function (acc, n, i, l) {
+        var iPrev = i ? i - 1 : 0;
+        return i ? acc.concat(l[iPrev] + l[i]) : acc
+      }, []);
+    }
+
+    // Next line in a Pascal triangle series
+    // [n] --> [n]
+    function nextPascal(lst) {
+      return lst.length ? [1].concat(
+        pairSums(lst)
+      ).concat(1) : [1];
+    }
+
+    // Each row is a function of the preceding row
+    return n ? Array.apply(null, Array(n - 1)).reduce(
+      function (a, _, i) {
+        return a.concat([nextPascal(a[i])]);
+      }, [[1]]) : [];
+  }
+
+  // TEST
+  var lstTriangle = pascalTriangle(n);
+
+
+  // FORMAT OUTPUT AS WIKI TABLE
+
+  // [[a]] -> bool -> s -> s
+  function wikiTable(lstRows, blnHeaderRow, strStyle) {
+    return '{| class="wikitable" ' + (
+      strStyle ? 'style="' + strStyle + '"' : ''
+    ) + lstRows.map(function (lstRow, iRow) {
+      var strDelim = ((blnHeaderRow && !iRow) ? '!' : '|');
+
+      return '\n|-\n' + strDelim + ' ' + lstRow.map(function (v) {
+        return typeof v === 'undefined' ? ' ' : v;
+      }).join(' ' + strDelim + strDelim + ' ');
+    }).join('') + '\n|}';
+  }
+
+  var lstLastLine = lstTriangle.slice(-1)[0],
+    lngBase = (lstLastLine.length * 2) - 1,
+    nWidth = lstLastLine.reduce(function (a, x) {
+      var d = x.toString().length;
+      return d > a ? d : a;
+    }, 1) * lngBase;
+
+  return [
+    wikiTable(
+      lstTriangle.map(function (lst) {
+        return lst.join(';;').split(';');
+      }).map(function (line, i) {
+        var lstPad = Array((lngBase - line.length) / 2);
+        return lstPad.concat(line).concat(lstPad);
+      }),
+      false,
+      'text-align:center;width:' + nWidth + 'em;height:' + nWidth +
+      'em;table-layout:fixed;'
+    ),
+
+    JSON.stringify(lstTriangle)
+  ].join('\n\n');
+})(7);

Task/Pascals-triangle/JavaScript/pascals-triangle-3.js

@@ -0,0 +1 @@
+[[1],[1,1],[1,2,1],[1,3,3,1],[1,4,6,4,1],[1,5,10,10,5,1],[1,6,15,20,15,6,1]]