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@@ -204,7 +204,7 @@ Square no longer keeps its own state; it receives its value from its parent `Boa
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## Why Immutability Is Important
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In the previous code example, I suggest using the `.slice()` operator to copy the `squares` array prior to making changges and to prevent mutating the existing array. Let's talk about what this means and why it an important concept to learn.
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In the previous code example, I suggest using the `.slice()` operator to copy the `squares` array prior to making changes and to prevent mutating the existing array. Let's talk about what this means and why it an important concept to learn.
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There are generally two ways for changing data. The first, and most common method in past, has been to *mutate* the data by directly changing the values of a variable. The second method is to replace the data with a new copy of the object that also includes desired changes.
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