mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
Yukihiro "Matz" Matsumoto
67 lines
1.4 KiB
Markdown
67 lines
1.4 KiB
Markdown
# Limitations and Differences
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The philosophy of mruby is to be a lightweight implementation of
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the Ruby ISO standard. These two objectives are partially contradicting.
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Ruby is an expressive language with complex implementation details which
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are difficult to implement in a lightweight manner. To cope with this,
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limitations to the "Ruby Compatibility" are defined.
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This document is collecting these limitations.
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## Integrity
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This document does not contain a complete list of limitations.
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Please help to improve it by submitting your findings.
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## ```1/2``` gives ```0.5```
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Since mruby does not have ```Bignum```, bigger integers are represented
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by ```Float``` numbers. To enhace interoperability between ```Float```
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and ```Float```, mruby provides ``Float#upto``` and other iterationg
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methods for ```Float`` class. As a side effect, ```1/2``` gives ```0.5```
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not ```0```.
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## ```Array``` passed to ```puts```
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Passing an Array to ```puts``` results in different output.
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```ruby
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puts [1,2,3]
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```
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#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
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```
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1
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2
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3
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```
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#### mruby [1.2.0 (2015-11-17)]
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```
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[1, 2, 3]
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```
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## ```Kernel.raise``` in rescue clause
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```Kernel.raise``` without arguments does not raise the current exception within
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a rescue clause.
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```ruby
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begin
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1 / 0
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rescue
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raise
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end
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```
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#### Ruby [ruby 2.0.0p645 (2015-04-13 revision 50299)]
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```ZeroDivisionError``` is raised.
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#### mruby [1.2.0 (2015-11-17)]
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No exception is raised.
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