Update tutorial to show new lambda syntax. #166
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Also makes some corrections around some details about lambdas.
Theodus
reviewed
Nov 6, 2016
| try | ||
| f(l.shift()) | ||
| for_each(l, f) | ||
| end | ||
| ``` | ||
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| This example declares the type of the apply function that is generated by the lambda expression as being `ref`. The type declaration for it in the `for_each` method also declares it as `ref`. The lambda function captures some variables so the object that is generated is `ref` and the default for the type declaration is `ref` so everything type checks. | ||
| This example declares the type of the apply function that is generated by the | ||
| lambda expression as being `ref`. The lambda type declaration for the `f` parameter in the `for_each` method also declares it as `ref`. The reference capability of the lambda type must also be `ref` so that the method can be called. The lambda object does not need to declare an explicit reference capability because `val` is the default for a lambda that has captures. |
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Shouldn't the last sentence say that ref is the default for a lambda that has captures?
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Good catch, it was a copy-paste mistake. Fixed and squashed.
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This PR updates the tutorial to show the new lambda syntax. It also makes some corrections around some details about lambdas.
See ponylang/ponyc#1400 for the implementation of the change.