Merge pull request #5161 from Abigail/abigail/week-137

Abigail/week 137

3 files changed, 107 insertions, 0 deletions

diff --git a/challenge-137/abigail/node/ch-1.js b/challenge-137/abigail/node/ch-1.js
new file mode 100644
index 0000000000..a744551341
--- /dev/null
+++ b/challenge-137/abigail/node/ch-1.js
@@ -0,0 +1,40 @@
+#!/usr/local/bin/node
+
+//
+// See ../README.md
+//
+
+//
+// Run as: node ch-1.js
+//
+
+
+let start_years       = [1600, 2000]
+let long_year_offsets = [
+      4,      9,     15,     20,     26,
+     32,     37,     43,     48,     54,
+     60,     65,     71,     76,     82,
+     88,     93,     99,            
+            105,    111,    116,    122,
+    128,    133,    139,    144,    150,
+    156,    161,    167,    172,    178,
+    184,    189,    195,            
+            201,    207,    212,    218,
+    224,    229,    235,    240,    246,
+    252,    257,    263,    268,    274,
+    280,    285,    291,    296,    
+                    303,    308,    314,
+    320,    325,    331,    336,    342,
+    348,    353,    359,    364,    370,
+    376,    381,    387,    392,    398
+]
+
+
+start_years . forEach (start_year => {
+    long_year_offsets . forEach (offset => {
+        let year = start_year + offset
+        if (1900 <= year && year <= 2100) {
+            console . log (year)
+        }
+    })
+})
diff --git a/challenge-137/abigail/node/ch-1a.js b/challenge-137/abigail/node/ch-1a.js
new file mode 100644
index 0000000000..e0e8d46341
--- /dev/null
+++ b/challenge-137/abigail/node/ch-1a.js
@@ -0,0 +1,37 @@
+#!/usr/local/bin/node
+
+//
+// See ../README.md
+//
+
+//
+// Run as: node ch-1a.js < input-file
+//
+
+let SUNDAY    = 0
+let MONDAY    = 1
+let TUESDAY   = 2
+let WEDNESDAY = 3
+let THURSDAY  = 4
+let FRIDAY    = 5
+let SATURDAY  = 6
+
+function doomsday (year) {
+    let anchor   = [TUESDAY, SUNDAY, FRIDAY, WEDNESDAY]
+                   [Math . floor (year / 100) % 4]
+    let y        = year % 100
+    let doomsday = ((Math . floor  (y / 12) + (y % 12) +
+                     Math . floor ((y % 12) / 4)) + anchor) % 7
+    return (doomsday)
+}
+
+function is_leap (year) {
+    return ((year % 400 == 0) || (year % 4 == 0 && year % 100 != 0))
+}
+
+for (year = 1900; year <= 2100; year ++) {
+    let dec_31 = (doomsday (year) + 31 - 12) % 7
+    if (dec_31 == THURSDAY || dec_31 == FRIDAY && is_leap (year)) {
+        console . log (year)
+    }
+}
diff --git a/challenge-137/abigail/node/ch-2.js b/challenge-137/abigail/node/ch-2.js
new file mode 100644
index 0000000000..75eef836c8
--- /dev/null
+++ b/challenge-137/abigail/node/ch-2.js
@@ -0,0 +1,30 @@
+#!/usr/local/bin/node
+
+//
+// See ../README.md
+//
+
+//
+// Run as: node ch-2.js < input-file
+//
+
+function reverse (num) {
+    let rev = 0
+    while (num > 0) {
+        rev *= 10
+        rev += num % 10
+        num  = Math . floor (num / 10)
+    }
+    return (rev)
+}
+
+function ly (n) {
+    return n >= 10000000    ? 1
+         : n == reverse (n) ? 0
+         : ly (n + reverse (n))
+}
+
+  require ('readline')
+. createInterface ({input: process . stdin})   
+. on              ('line', num => console . log (ly (+num)))
+