Initial data commit

Task/Factorial/Jsish/factorial.jsish

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+/* Factorial, in Jsish */
+
+/* recursive */
+function fact(n) { return ((n < 2) ? 1 : n * fact(n - 1)); }
+
+/* iterative */
+function factorial(n:number) {
+    if (n < 0) throw format("factorial undefined for negative values: %d", n);
+
+    var fac = 1;
+    while (n > 1) fac *= n--;
+    return fac;
+}
+
+if (Interp.conf('unitTest') > 0) {
+;fact(18);
+;fact(1);
+
+;factorial(18);
+;factorial(42);
+try { factorial(-1); } catch (err) { puts(err); }
+}