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Diffstat (limited to 'doc/limitations.md')
| -rw-r--r-- | doc/limitations.md | 42 |
1 files changed, 24 insertions, 18 deletions
diff --git a/doc/limitations.md b/doc/limitations.md index 770daa7a4..8ac959b98 100644 --- a/doc/limitations.md +++ b/doc/limitations.md @@ -17,7 +17,7 @@ Please help to improve it by submitting your findings. ## `1/2` gives `0.5` Since mruby does not have `Bignum`, bigger integers are represented -by `Float` numbers. To enhance interoperability between `Fixnum` +by `Float` numbers. To enhance interoperability between `Integer` and `Float`, mruby provides `Float#upto` and other iterating methods for the `Float` class. As a side effect, `1/2` gives `0.5` not `0`. @@ -63,8 +63,15 @@ end #### mruby [2.1.2 (2020-08-06)] -No exception is raised. +No exception is raised. Instead you have to do: +```ruby +begin + 1 / 0 +rescue => e + raise e +end +``` ## Fiber execution can't cross C function boundary mruby's `Fiber` is implemented in a similar way to Lua's co-routine. This @@ -245,8 +252,7 @@ trace (most recent call last): ## Keyword arguments mruby keyword arguments behave slightly different from CRuby 2.5 -to make the behavior simpler and less confusing. Maybe in the -future, the simpler behavior will be adopted to CRuby as well. +to make the behavior simpler and less confusing. #### Ruby [ruby 2.5.1p57 (2018-03-29 revision 63029)] @@ -264,6 +270,20 @@ trace (most recent call last): -e:1: keyword argument hash with non symbol keys (ArgumentError) ``` +## `nil?` redefinition in conditional expressions + +Redefinition of `nil?` is ignored in conditional expressions. + +```ruby +a = "a" +def a.nil? + true +end +puts(a.nil? ? "truthy" : "falsy") +``` + +Ruby outputs `falsy`. mruby outputs `truthy`. + ## Argument Destructuring ```ruby @@ -283,17 +303,3 @@ f(1,[2,3]) ``` CRuby gives `[1,2,3,nil]`. mruby raises `NoMethodError` for `b`. - -## `nil?` redefinition in conditional expressions - -Redefinition of `nil?` is ignored in conditional expressions. - -```ruby -a = "a" -def a.nil? - true -end -puts(a.nil? ? "truthy" : "falsy") -``` - -Ruby outputs `falsy`. mruby outputs `truthy`. |