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+// [JS][7kyu] Ship of Theseus  Theseus
+// ship-of-theseus-theseus
+// https://www.codewars.com/kata/69b83710b26939b35fd10429/train/javascript
+
+const getDiff = (a, b) => {
+  let diff = 0
+  const aLength = a.length
+  for (let i = 0; i < aLength; i += 1) {
+    if (a[i] !== b[i]) {
+      diff += 1
+    }
+  }
+  return diff
+}
+
+const shipOfTheseus = (ship) => {
+  const shipLength = ship.length
+  let prev = ship[0]
+  for (let i = 1; i < shipLength; i += 1) {
+    const diff = getDiff(prev, ship[i])
+    if (diff !== 1) {
+      return false
+    }
+    prev = ship[i]
+  }
+  return true
+}
+
+// shipOfTheseus([
+//   ['a', 'b', 'c'],
+//   ['x', 'b', 'c'],
+//   ['x', 'y', 'c'],
+//   ['x', 'y', 'z'],
+// ])
+
+// shipOfTheseus([
+//   ['a', 'b', 'c'],
+//   ['x', 'y', 'c'],
+// ])
+
+// shipOfTheseus([
+//   ['a', 'b'],
+//   ['a', 'b'],
+// ])
+
+// shipOfTheseus([
+//   ['g', 'w', 'x', 'd', 'o', 'r'],
+//   ['g', 'w', 'x', 'd', 'o', 'v'],
+//   ['g', 'w', 'x', 'w', 'o', 'v'],
+//   ['g', 'w', 'x', 'w', 'o', 'v'],
+//   ['g', 'w', 's', 'w', 'o', 'v'],
+// ])