Word Chain 2.0

Let's update our previous word-chain definition. In this 2.0 version, a word-chain is an array of words, where the next word is formed by either:

1. Changing exactly one letter from the previous word.
2. Adding or subtracting one letter.

Examples

isWordChain(["row", "crow", "crown", "brown", "brawn"]) ➞ true
// add "c" to "row" to get "crow", "n" to get "crown", etc.

isWordChain(["flew", "flaw", "flan", "flat", "fat", "rat", "rot", "tot"]) ➞ true

isWordChain(["meek", "meet", "meat", "teal"]) ➞ false
// "meat" => "teal" changes 2 letters (can only change 1).

isWordChain(["run", "runny", "bunny"]) ➞ false
// "run" => "runny" adds 2 letters (can only add 1).

Notes

• You can only do one (not both) for each word change.
• All words will be in lower-case.