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doc: clear up concurrency and immutable fn args
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doc/docs.md
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doc/docs.md
@ -107,7 +107,7 @@ For more details and troubleshooting, please visit the [vab GitHub repository](h
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</td><td width=33% valign=top>
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* [Functions 2](#functions-2)
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* [Pure functions by default](#pure-functions-by-default)
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* [Immutable function args by default](#immutable-function-args-by-default)
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* [Mutable arguments](#mutable-arguments)
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* [Variable number of arguments](#variable-number-of-arguments)
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* [Anonymous & higher-order functions](#anonymous--higher-order-functions)
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@ -343,8 +343,7 @@ the expression `T(v)` converts the value `v` to the
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type `T`.
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Unlike most other languages, V only allows defining variables in functions.
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Global (module level) variables are not allowed. There's no global state in V
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(see [Pure functions by default](#pure-functions-by-default) for details).
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Global (module level) variables are not allowed. There's no global state in V.
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For consistency across different code bases, all variable and function names
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must use the `snake_case` style, as opposed to type names, which must use `PascalCase`.
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@ -2279,13 +2278,13 @@ Note that the embedded struct arguments are not necessarily stored in the order
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## Functions 2
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### Pure functions by default
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### Immutable function args by default, mutable args have to be marked on call
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V functions are pure by default, meaning that their return values are a function of their
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arguments only, and their evaluation has no side effects (besides I/O).
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In V function args are immutable by default, mutable args have to be marked on call.
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Since there are also no globals, that means that functions' return values are a function of their
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arguments only, and their evaluation has no side effects (unless the function uses I/O).
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This is achieved by a lack of global variables and all function arguments being
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immutable by default, even when [references](#references) are passed.
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Function arguments are immutable by default even when [references](#references) are passed.
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V is not a purely functional language however.
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@ -3601,8 +3600,8 @@ println(compare(1.1, 1.2)) // -1
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## Concurrency
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### Spawning Concurrent Tasks
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V's model of concurrency is very similar to Go's. To run `foo()` concurrently in
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a different thread, just call it with `go foo()`:
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V's model of concurrency is going to be very similar to Go's. For now, `go foo()` runs `foo()` concurrently in
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a different thread:
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```v
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import math
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@ -3618,6 +3617,9 @@ fn main() {
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}
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```
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> In V 0.4 `go foo()` will be automatically renamed via vfmt to `spawn foo()`, and there will be a way to launch
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a coroutine (a lightweight thread managed by the runtime).
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Sometimes it is necessary to wait until a parallel thread has finished. This can
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be done by assigning a *handle* to the started thread and calling the `wait()` method
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to this handle later:
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