JSFiddle - React, Tailwind, and code Playground
JavaScript
var line = 'Sweettoothed';
var i = 0,
len = line.length,
buffer = [],
curr = '',
last = '',
result = '';
for(i; i < len; i++) {
curr = line[i];
last = buffer[buffer.length -1];
buffer.push(curr);
// console.log(curr, last);
if(curr !== last) {
console.log(last);
}
}
console.log(result);