From 835bc8509e170b4fe26eddc6237e0b30ecd1ea6d Mon Sep 17 00:00:00 2001
From: Nick Thomas <me@ur.gs>
Date: Sat, 5 Dec 2020 14:11:59 +0000
Subject: [PATCH] Return to using ranges for day 5

---
 05/part1.js | 45 +++++++++++----------------------------------
 05/part2.js | 45 +++++++++++----------------------------------
 2 files changed, 22 insertions(+), 68 deletions(-)

diff --git a/05/part1.js b/05/part1.js
index dea01de..06c7f3d 100644
--- a/05/part1.js
+++ b/05/part1.js
@@ -6,47 +6,24 @@ const readInterface = readline.createInterface({
     console: false
 });
 
-// [[x,y], [x,y], ...]
-let seats = [];
-
-function makeArray(n) {
-  let ary = new Array(n);
-  for(i=0; i<n; i++) {
-    ary[i] = i;
-  }
-
-  return ary;
-}
+let seats = []; // [[x,y], [x,y], ...]
 
 readInterface.on('line', function(line) {
-  const rowSpec = line.substring(0, 7);
-  const colSpec = line.substring(7, 10);
+  let result = line.split('').reduce(function(sp, char) {
+    const halfX = Math.floor((1 + sp[2] - sp[0]) / 2);
+    const halfY = Math.floor((1 + sp[3] - sp[1]) / 2);
 
-  let row = rowSpec.split('').reduce(function(range, char) {
-    const half = Math.floor(range.length / 2);
-
-    let r2 = range;
     switch(char) {
-    case 'F': r2 = range.slice(0, half+1); break;
-    case 'B': r2 = range.slice(half, range.length); break;
+    case 'F': sp[3] -= halfY; break;
+    case 'B': sp[1] += halfY; break;
+    case 'L': sp[2] -= halfX; break;
+    case 'R': sp[0] += halfX; break;
     };
 
-    return r2;
-  }, makeArray(128));
+    return sp;
+  }, [0,0,7,127]);
   
-  let col = colSpec.split('').reduce(function(range, char) {
-    const half = Math.floor(range.length / 2);
-
-    let r2 = range;
-    switch(char) {
-    case 'L': r2 = range.slice(0, half+1); break;
-    case 'R': r2 = range.slice(half,range.length); break;
-    };
-
-    return r2;
-  }, makeArray(8));
-
-  seats.push([col[0], row[0]]);
+  seats.push([result[0], result[1]]);
 });
 
 readInterface.on('close', function(line) {
diff --git a/05/part2.js b/05/part2.js
index f5fb8f6..57b686f 100644
--- a/05/part2.js
+++ b/05/part2.js
@@ -6,47 +6,24 @@ const readInterface = readline.createInterface({
     console: false
 });
 
-// [[x,y], [x,y], ...]
-let seats = [];
-
-function makeArray(n) {
-  let ary = new Array(n);
-  for(i=0; i<n; i++) {
-    ary[i] = i;
-  }
-
-  return ary;
-}
+let seats = []; // [[x,y], [x,y], ...]
 
 readInterface.on('line', function(line) {
-  const rowSpec = line.substring(0, 7);
-  const colSpec = line.substring(7, 10);
+  let result = line.split('').reduce(function(sp, char) {
+    const halfX = Math.floor((1 + sp[2] - sp[0]) / 2);
+    const halfY = Math.floor((1 + sp[3] - sp[1]) / 2);
 
-  let row = rowSpec.split('').reduce(function(range, char) {
-    const half = Math.floor(range.length / 2);
-
-    let r2 = range;
     switch(char) {
-    case 'F': r2 = range.slice(0, half+1); break;
-    case 'B': r2 = range.slice(half, range.length); break;
+    case 'F': sp[3] -= halfY; break;
+    case 'B': sp[1] += halfY; break;
+    case 'L': sp[2] -= halfX; break;
+    case 'R': sp[0] += halfX; break;
     };
 
-    return r2;
-  }, makeArray(128));
+    return sp;
+  }, [0,0,7,127]);
   
-  let col = colSpec.split('').reduce(function(range, char) {
-    const half = Math.floor(range.length / 2);
-
-    let r2 = range;
-    switch(char) {
-    case 'L': r2 = range.slice(0, half+1); break;
-    case 'R': r2 = range.slice(half,range.length); break;
-    };
-
-    return r2;
-  }, makeArray(8));
-
-  seats.push([col[0], row[0]]);
+  seats.push([result[0], result[1]]);
 });
 
 readInterface.on('close', function(line) {