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| -rw-r--r-- | 08-expressions.md | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/08-expressions.md b/08-expressions.md index e951350fb3..6e8e44051d 100644 --- a/08-expressions.md +++ b/08-expressions.md @@ -435,12 +435,14 @@ parameterlist `()`. ###### Example The method values in the left column are each equivalent to the [eta-expanded expressions](#eta-expansion) on the right. -| | | +| placeholder syntax | eta-expansion | |------------------------------ | --------------------------------------------| |`Math.sin _` | `x => Math.sin(x)` | |`Array.range _` | `(x1, x2) => Array.range(x1, x2)` | -|`List.map2 _` | `(x1, x2) => (x3) => List.map2(x1, x2)(x3)` | -|`List.map2(xs, ys)_` | `{ val eta1 = xs; val eta2 = ys; x => List.map2(eta1, eta2)(x) }` | +|`map2 _` | `(x1, x2) => (x3) => map2(x1, x2)(x3)` | +|`map2(xs, ys)_` | `{ val eta1 = xs; val eta2 = ys; x => map2(eta1, eta2)(x) }` | + +This assumes a method `def map2[A, B, C](xs: List[A], ys: List[B])(f: (A, B) => C): List[C]`. Note that a space is necessary between a method name and the trailing underscore |