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Add trait with type to foldLeft def #1778

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Merged
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Sep 19, 2020
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Add trait with type to foldLeft def #1778

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Add trait with type to foldLeft def
babo Sep 18, 2020
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Update _tour/multiple-parameter-lists.md
babo Sep 19, 2020
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Update _tour/multiple-parameter-lists.md
babo Sep 19, 2020
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8 changes: 6 additions & 2 deletions _tour/multiple-parameter-lists.md
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Expand Up @@ -14,10 +14,14 @@ Methods may have multiple parameter lists.

### Example

Here is an example, as defined on the `TraversableOnce` trait in Scala's collections API:
Here is an example, as defined on the `Iterable` trait in Scala's collections API:

```
def foldLeft[B](z: B)(op: (B, A) => B): B
trait Iterable[A] {
...
def foldLeft[B](z: B)(op: (B, A) => B): B
...
}
```

`foldLeft` applies a two-parameter function `op` to an initial value `z` and all elements of this collection, going left to right. Shown below is an example of its usage.
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