please explain how to do this in simple method

[sadhana]

Given a sequence of uppercase letters, we want to remove all but one occurrence of each letter, doing it in such a way that the remaining letters are in alphabetical order. Of course, there may be no way to do this, but if there is, we want to know which letters to remove.
Create a class MakeUnique that contains a method eliminated that is given a String original, and returns original with the eliminated letters replaced with periods ('.'). The remaining letters must be in alphabetical order.
If there is no way to do this, return a String with length 0.
If there are several ways to do this, choose the one with the shortest length between the first and last remaining letters. If there are still several ways, return the String among these that comes earliest lexicographically ('.' comes earlier than any letter in the ASCII sequence).

"ABBBXCXABCX"

Returns: ".......ABCX"
The 4 letters ABCX must remain, and in that order. "AB...CX...." would also leave these letters in the appropriate order, but the length between the first and last remaining letters would be longer than in the given answer.

"ABBBXCXABCB"

Returns: "A..B.CX...."
"AB...CX...." and "A.B..CX...." are also possible and have the same length between first and last remaining letters, but they come later lexicographically than the given answer.

"ABBBXCABCB"

Returns: ""
There is no way to eliminate letters and end up with C before X.

"AABACBXABX"

Returns: ".AB.C.X..."

"CABDEAFDEGSDABCDEADFGSEFBGS"

Returns: "............ABCDE..FGS....."

"AAAAAA"

Returns: ".....A"

[steven]

Just off the top of my head, perhaps you can throw the values into an array, then remove duplicate values from the array. I'm not extremely experienced in Javascript, but perhaps there's a function like PHPs array_unique.

Forget about the code for a moment anyway and sit down with some paper and a pen and write how this should all work. What has to happen and in what order.

Also, if this is for an assignment, it's worth you struggling to find the answer (if you want to learn anyway).

[sadhana]

Just off the top of my head, perhaps you can throw the values into an array, then remove duplicate values from the array. I'm not extremely experienced in Javascript, but perhaps there's a function like PHPs array_unique.

Forget about the code for a moment anyway and sit down with some paper and a pen and write how this should all work. What has to happen and in what order.

Also, if this is for an assignment, it's worth you struggling to find the answer (if you want to learn anyway).

hi,
Iam trying this using array only. Iam not getting the output.. Any way thank you for your help.

[netaman]

One way to eliminate duplicates from an array

var array1 = new Array(100);
var noDupArray = new Array(100);

array1 = array1.sort();
var compVar = "XZXZXZ"
var fox = 0;
for (i=0;i<100;i++)
{
if (array1[i] != compVar)
{
noDupArray[fox++] = array1[i];
compVar = array1[i];
}
}