diff options
Diffstat (limited to 'enumerator.c')
| -rw-r--r-- | enumerator.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/enumerator.c b/enumerator.c index 18d06bb3e9..eee3a34e6b 100644 --- a/enumerator.c +++ b/enumerator.c @@ -295,7 +295,8 @@ proc_entry_ptr(VALUE proc_entry) * obj.enum_for(method = :each, *args){|*args| block} -> enum * * Creates a new Enumerator which will enumerate by calling +method+ on - * +obj+, passing +args+ if any. + * +obj+, passing +args+ if any. What was _yielded_ by method becomes + * values of enumerator. * * If a block is given, it will be used to calculate the size of * the enumerator without the need to iterate it (see Enumerator#size). @@ -314,6 +315,11 @@ proc_entry_ptr(VALUE proc_entry) * a = [1, 2, 3] * some_method(a.to_enum) * + * # String#split in block form is more memory-effective: + * very_large_string.to_enum(:split, "|") { |chunk| return chunk if chunk.include?('DATE') } + * # This could be rewritten more idiomatically with to_enum: + * very_large_string.to_enum(:split, "|").lazy.grep(/DATE/).first + * * It is typical to call to_enum when defining methods for * a generic Enumerable, in case no block is passed. * |