Node.js solution for week 102, part 2

1 files changed, 36 insertions, 0 deletions

diff --git a/challenge-102/abigail/node/ch-2.js b/challenge-102/abigail/node/ch-2.js
new file mode 100644
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+++ b/challenge-102/abigail/node/ch-2.js
@@ -0,0 +1,36 @@
+#!/usr/local/bin/node
+
+//
+// See ../README.md
+//
+
+//
+// Run as: node ch-2.js < input-file
+//
+
+require ('readline')
+. createInterface ({input: process . stdin})   
+. on ('line', _ => make_hash (+ _))
+;
+
+
+//
+// Working from the end of the required string backwards, we alternate
+// placing a hash, and placing a number. We place them in an array @out,
+// and at the end, print out said array in reverse order.
+//
+function make_hash (index) {
+    let out = []
+    let hash = false
+    while (index > 0) {
+        if (hash = !hash) {
+            out . push ("#")
+            index --
+        }
+        else {
+            out . push (index + 1)
+            index -=   (index + 1) . toString () . length
+        }
+    }
+    console . log (out . reverse () . join (""))
+}