AWK, Bash, Lua, Node.js, Perl, Python, Ruby solutions for week 116, part 1

1 files changed, 41 insertions, 0 deletions

diff --git a/challenge-116/abigail/node/ch-1.js b/challenge-116/abigail/node/ch-1.js
new file mode 100644
index 0000000000..e4bcb1961e
--- /dev/null
+++ b/challenge-116/abigail/node/ch-1.js
@@ -0,0 +1,41 @@
+#!/usr/local/bin/node
+
+//
+// See ../README.md
+//
+
+//
+// Run as: node ch-1.js < input-file
+//
+
+  require         ('readline')
+. createInterface ({input: process . stdin})   
+. on              ('line', line => main (line))
+
+function make_chain (string, start) {
+    if (string == start) {
+        return [start]
+    }
+    if (0 == string . indexOf (start)) {
+        let tail = string . substr (start . length)
+        let result = make_chain (tail, (+ start + 1) . toString ()) ||
+                     make_chain (tail, (+ start - 1) . toString ())
+        if (result) {
+            result . unshift (start)
+            return result
+        }
+    }
+    return null
+}
+
+
+function main (line) {
+    for (let i = 1; i <= line . length; i ++) {
+        let start  = line . substr (0, i)
+        let result = make_chain (line, start)
+        if (result) {
+            console . log (result . join (","))
+            break
+        }
+    }
+}