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Add trait with type to foldLeft def #1778

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Merged
merged 3 commits into from
Sep 19, 2020
Merged

Add trait with type to foldLeft def #1778

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Add trait with type to foldLeft def
babo Sep 18, 2020
4817b1b
Update _tour/multiple-parameter-lists.md
babo Sep 19, 2020
bd52a6c
Update _tour/multiple-parameter-lists.md
babo Sep 19, 2020
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6 changes: 5 additions & 1 deletion _tour/multiple-parameter-lists.md
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Expand Up @@ -17,7 +17,11 @@ Methods may have multiple parameter lists.
Here is an example, as defined on the `TraversableOnce` trait in Scala's collections API:

```
def foldLeft[B](z: B)(op: (B, A) => B): B
trait TraversableOnce[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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