Feature #4615

Add IO#split and iterative form of String#split

Added by yimutang (Joey Zhou) over 9 years ago. Updated over 9 years ago.

Target version:


file.each_line(sep=$/) {|line| ... } can be used to iterate on lines.

But the separator is just a string or nil, it cannot be a regexp.

Sometimes I may want to iterate on "sentences", which are strings separated by (simply say) punctuations ".;!?".

So if I can write it like this:

file.split(/[.;!?]/) {|sentence| ... }

I think it will be very convenient.

You may say I can write it like this:

file.gets(nil).split(/[.;!?]/).each {|sentence| ... }

But this code will: (1) slurp in the whole file; (2) create a temporary array. It the file is a big one, those 2 steps seem both expensive and unnessary.

So I suggest a flexible IO#split: (also available for File and ARGF)

io.split(pattern=$/) {|field|...} -> io # default pattern is $/, not $;
io.split(pattern=$/) -> enumerator # not array

(I think adding a new method is better, rather than modifying the IO#each_line, making it accept regexp as argument.)

Well, String#split has only one form:

str.split(pattern=$;, limit=0) -> array

Maybe add a iterative form, when with a block:

str.split(pattern=$;, limit=0) {|field| ... } -> str

Joey Zhou

Related issues

Related to Ruby master - Feature #4780: String#split with a blockClosedmatz (Yukihiro Matsumoto)Actions

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