20 lines
846 B
Markdown
20 lines
846 B
Markdown
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## Extension Lambdas (#1)
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Define the following functions so they behave the same as their standard
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library counterparts:
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- `createString()` behaves like `buildString()`. Start by creating a new
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instance of `StringBuilder`, call the extension lambda argument on it, then
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return the `String` result.
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- `createList()` behaves like `buildList()`. This function has one generic
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parameter. Create an `ArrayList<T>`, call the extension lambda argument on it,
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and return the `List` in immutable form.
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- `createMap()` behaves like `buildMap()`. This function has two generic
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parameters. Create a `HashMap<K, V>`, call the extension lambda argument on it,
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and return the `Map` in immutable form.
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The code in `main()` tests your functions against the standard library
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versions. Notice that `buildList()` and `buildMap()` infer their generic
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parameters.
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