Day 2 Mark

day 2/day_2_mark.js

+diff = x => x.map((y,i,l)=>x[i+1]-y).slice(0,-1)
+split = x => x.split(" ").map(Number)
+bounds1 = x => x >= 1 && x <= 3
+bounds2 = x => x >= -3 && x <= -1
+isSafe = x => x.every(bounds1) || x.every(bounds2)
+
+output1 = input.split("\n").map(split).map(diff).map(isSafe).reduce((x,y)=>x+y)
+
+dampener = x => isSafe(diff(x)) || x.some((y,z) => isSafe(diff(x.filter((a,b)=>b!=z))))
+output2 = input.split("\n").map(split).map(dampener).reduce((x,y)=>x+y)
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