Compare string in list

Question

I want to match two string in the same list. I want to get words from a string and insert into list. I want to remove white space and separate by commas. Then I want to check two string in that list whether match or not.

Here is my code:

main() {
  List<String> list = new List();
  String str = "dog , dog , cat, tiger, lion, cat";
  String strn = str.replaceAll(" " , "");
  list = strn.split(",");

  print(list.length);
  print(list);

  for (int i=0;i<list.length;i++){
    if (list[i] == list[i+1]) {
      print("same");
    } else{
      print("not same");
    }
    i++;
  }
}

here string only check upto length 4. and white space not removed!

What is your question? I can see that you increment i twice (i++ in the for header and in its body) and that you count one too far in the loop (if i is list.length - 1 then list[i+1] will throw, you just happen to dodge this by incrementing i twice so it never hits the value 5). — lrn
– lrn, Commented Oct 18, 2018 at 11:30
My question why it doesn't hit index 4 and 5? and why it doesn't remove white space? — Falak
– Falak, Commented Oct 18, 2018 at 11:40
The double increment of i answers the first question (it actually doesn't hit indices 1, 3 and 5). Also, it does remove white-space. Instead of print(list);, try using print(list.join(","));. The List.toString method adds comma+space between elements. — lrn
– lrn, Commented Oct 18, 2018 at 13:47

graphicbeacon · Accepted Answer · 2018-10-18 14:58:36Z

I also noticed that in the for loop you are incrementing i twice, the second being close to the bottom. This causes i to skip some of the indexes, so loop looks at index 0, then 2, then 4, then it stops.

I have refactored your solution slightly. I removed the second i++ and changed i < list.length to i < list.length - 1 to skip the last item as list[i + 1] will throw an out of range exception:

main() {
  List<String> list = new List();
  String str = "dog , dog , cat, tiger, lion, cat";
  String strn = str.replaceAll(" ", "");
  list = strn.split(",");

  print(list.length);
  print(list.join('|'));

  for(int i=0; i < list.length - 1; i++){
    if(list[i] == list[i+1]){
      print("same");
    }
    else{
      print("not same");
    }
  }
}

The result of the loop is so:

same
not same
not same
not same
not same

You can test this out on DartPad

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