![]() ![]() ![]() Later in this tutorial, you will implement a “time travel” feature that lets you review the game’s history and “jump back” to past moves. ![]() Immutability makes complex features much easier to implement. The result is the same but by not mutating (changing the underlying data) directly, you gain several benefits. Now `squares` is unchanged, but `nextSquares` first element is 'X' rather than `null` In the end the user sees that the upper left square has changed from empty to having a X after clicking it. ![]() This causes the value prop of the Square component with index 0 to change from null to X.
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