var sample='dddddttqdsssssssssssdd';
var sampleSplit=sample.split('');
var arr1=[];
var arr2=[];
var aa=0;
var ab=0;
var ac=0;

arr1[0]=sampleSplit[0];
arr1[1]=1;

for(i=0; i<sampleSplit.length; i++){
if(sampleSplit[aa]==sampleSplit[aa+1]){
arr1[ab+1]++;
aa++;
}
if(sampleSplit[aa]!=sampleSplit[aa+1]){
arr1[ab+2]=sampleSplit[aa+1];
arr1[ab+3]=1;
ab+=2;
aa++;
}
}
arr1.pop(arr1.length-1);
arr1.pop(arr1.length);
ab=2;
aa=0;
ac=0;
arr2=arr1;

for(e=0; e<arr2.length; e++){
for(j=0; j<arr2.length; j++){
    if(arr2[aa]==arr2[ab]){
        arr2[aa+1]+=arr2[ab+1];
        arr2.splice(ab, 2);
    }
    ab+=2;
}
}