Node.js solution for week 106, part 2

1 files changed, 40 insertions, 0 deletions

diff --git a/challenge-106/abigail/node/ch-2.js b/challenge-106/abigail/node/ch-2.js
new file mode 100644
index 0000000000..166a3e050e
--- /dev/null
+++ b/challenge-106/abigail/node/ch-2.js
@@ -0,0 +1,40 @@
+#!/usr/local/bin/node
+
+//
+// See ../README.md
+//
+
+//
+// Run as: node ch-2.js < input-file
+//
+
+require ('readline')
+. createInterface ({input: process . stdin})   
+. on ('line', _ => console . log (long_division (... _ . split (" ")
+                                                       . map (_ => +_))))
+
+//
+// See ../README.md for info about this function
+//
+
+function long_division (numerator, denominator) {
+    let BASE = 10
+    let fraction = Math . floor (numerator / denominator) + "."
+    let position = fraction . length
+    let seen     = []
+
+    numerator %= denominator
+
+    while (!(numerator in seen)) {
+        if (!numerator) {
+            return (fraction)
+        }
+        seen [numerator] = position
+        fraction += Math . floor (BASE * numerator / denominator)
+        numerator =               BASE * numerator % denominator
+        position ++
+    }
+
+    return (fraction . substr (0, seen [numerator]) + "(" +
+            fraction . substr (   seen [numerator]) + ")")
+}