This seems special purpose enough (as you say, for legacy formats) and easy enough to implement, that it probably doesn't warrant being included in the language.
- Russ On Mar 23, 2012, at 5:36 PM, "Roger Andrews" <[email protected]> wrote: > String.prototype.split is good for cutting records into fields based on a > delimiter string or regexp. E.g. > rec.split( ',' ) // split CSV record (no commas in fields) > rec.split( /\s+/ ) // split into whitespace-separated fields > > How about extending 'split', or inventing a new method 'splitlen', which > splits a record into defined-length fields? This simplifies a long list of > 'substring's. > > > Old data formats invented in the days of punch-cards are still around. For > example NASA's two-line element set > (http://en.wikipedia.org/wiki/Two-line_element_set) > which records the orbital elements of Earth satellites. > E.g. here is the TLE for for International Space Station: > ISS (ZARYA) > 1 25544U 98067A 08264.51782528 -.00002182 00000-0 -11606-4 0 2927 > 2 25544 51.6416 247.4627 0006703 130.5360 325.0288 15.72125391563537 > > Proposed design: > split( len1, len2, len3, len4, ..... ) // returns array of fields > where each numeric length argument either > (1) captures a field of the given length if positive, or > (2) ignores a field of the absolute given length if negative. > The special argument "*" could repeat the previous argument to the end of > the record. > > Examples: > // chop into 5-char fields > rec.split( 5, "*" ) > // capture a 1-char and a 5-char field and all chars after index 17 > rec.split( -7, 1, 5, -4, Infinity ) > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
