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Clarify "the new" in dependent function types #3794

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Jan 12, 2018
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Clarify "the new" in dependent function types #3794

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Clarify "the new" in dependent function types
Jan 10, 2018
415525d
changed `class` to trait since `key` is abstract
Jan 10, 2018
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7 changes: 5 additions & 2 deletions docs/docs/reference/dependent-function-types.md
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Expand Up @@ -6,11 +6,14 @@ title: "Dependent Function Types"
A dependent function type describes functions where the result type may depend
on the function's parameter values. Example:

class Entry { type Key; key: Key }
class Entry { type Key; val key: Key }

def extractKey(e: Entry): e.Key = e.key // a dependent method
val extractor: (e: Entry) => e.Key = extractKey // a dependent function value

// ║ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ║
// ║ Dependent ║
// ║ Function Type ║
// ╚═══════════════════╝
Scala already has _dependent methods_, i.e. methods where the result
type refers to some of the parameters of the method. Method
`extractKey` is an example. Its result type, `e.key` refers its
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