add missing verb (#8139)
`why is an` should be `why it is an`
bel3atar committed
Oct 31, 2016 at 11:41 UTC
980cb01a845d92656776fc95ff60a1225f6b3406
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docs/tutorial/tutorial.md
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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 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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+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 is 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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