I'm having some trouble with a string represented as an array of characters. What I'd like to do, as I would do in java, is the following:

     while (i < chars.length) {
        char ch = chars[i];
        if ((WORD_CHARS.indexOf(ch) >= 0) == punctuation) {

            String token = buffer.toString();
            if (token.length() > 0) {
                parts.add(token);
            }
            buffer = new StringBuffer();

        }
        buffer.append(ch);
        i++;
    }

What I'm doing is something like this:

while(i < strlen(chars)) {

    char ch = chars[i];
    if(([WORD_CHARS rangeOfString:ch] >= 0) == punctuation) {

        NSString *token = buffer.toString();
        if([token length] > 0) {
            [parts addObject:token];
        }
        buffer = [NSMutableString string];
    }
    [buffer append(ch)];
    i++;
}

I'm not sure how I'm supposed to convert

 String token = buffer.toString();

to objective c, where buffer is an NSMutableString. Also, how do I check this if condition in objective c?

if ((WORD_CHARS.indexOf(ch) >= 0) == punctuation) 

WORD_CHARS is an NSString. I'm also having trouble with appending ch to buffer.

Any help is greatly appreciated.