JavaScript equivalent of Python’s rsplit
str.rsplit([sep[, maxsplit]])
Return a
list of the words in the string, using
sep as the delimiter string. If
maxsplit is given, at most maxsplit
splits are done, the rightmost ones.
If sep is not specified or None, any
whitespace string is a separator.
Except for splitting from the right,
rsplit() behaves like split() which is
described in detail below.
String.prototype.rsplit = function(sep, maxsplit) {
var split = this.split(sep);
return maxsplit ? [ split.slice(0, -maxsplit).join(sep) ].concat(split.slice(-maxsplit)) : split;
}
This one functions more closely to the Python version
“blah,derp,blah,beep”.rsplit(“,”,1) // [ ‘blah,derp,blah’, ‘beep’ ]
You can also use JS String functions split + slice
Python:
'a,b,c'.rsplit(',' -1)[0] will give you 'a,b'
Javascript:
'a,b,c'.split(',').slice(0, -1).join(',') will also give you 'a,b'
Assuming the semantics of JavaScript split are acceptable use the following
String.prototype.rsplit = function (delimiter, limit) {
delimiter = this.split (delimiter || /s+/);
return limit ? delimiter.splice (-limit) : delimiter;
}
i think this is more “equivalent” until a bug is found, “close” is not acceptable for an answer.
String.prototype.rsplit = function(sep, maxsplit) {
var result = []
if ( (sep === undefined) ) {
sep = " "
maxsplit = 0
}
if (maxsplit === 0 )
return [this]
var data = this.split(sep)
if (!maxsplit || (maxsplit<0) || (data.length==maxsplit+1) )
return data
while (data.length && (result.length < maxsplit)) {
result.push( data.pop() )
}
if (result.length) {
result.reverse()
if (data.length>1) {
return [data.join(sep), result ]
}
return result
}
return [this]
}
