Node.js solution for week 097, part 1

1 files changed, 50 insertions, 0 deletions

diff --git a/challenge-097/abigail/node/ch-1.js b/challenge-097/abigail/node/ch-1.js
new file mode 100644
index 0000000000..0cba6f1a23
--- /dev/null
+++ b/challenge-097/abigail/node/ch-1.js
@@ -0,0 +1,50 @@
+#!/usr/local/bin/node
+
+//
+// See ../README.md
+//
+
+//
+// Run as: node ch-1.js -s TIMES < input-file
+//
+
+const NR_OF_LETTERS = 26
+
+//
+// Parse input
+//
+const argv = require ('yargs')
+. option ('s', {
+    type: 'number',
+  })
+. demandOption ('s')
+. argv;
+
+const shift = argv . s
+
+//
+// Shift capital letters, by a given amount.
+//
+function shift_char (char, shift) {
+    if (char . match (/[A-Z]/)) {
+        let n = char . charCodeAt (0) - (shift % NR_OF_LETTERS)
+        if (n < 65) {
+           n = n + NR_OF_LETTERS
+        }
+        return String . fromCharCode (n)
+    }
+    else {
+        return char
+    }
+}
+
+
+//
+// Iterate over the input, and shift characters
+//
+require ('readline')
+. createInterface ({input: process . stdin})   
+. on ('line', _ => console . log (_ . split ("")
+                                    . map   (_ => shift_char (_, shift))
+                                    . join  ("")))
+;