Cacher is the code snippet organizer for pro developers

function simplify(poly){
  let obj = {},ordered = {},expr = ''
  for(let i=0;i<poly.length;i++){
    let coeff='',canIterate = true,index = i,variable='',sign='+';
    while(canIterate){
      let val = poly[index]
      if(val ==="+" || val === '-') sign = val
      else if(!isNaN(parseInt(val))) coeff+=parseInt(val);
      else variable+=val;
      index++
      canIterate = poly[index] !== '-' && poly[index] !== '+' && index<poly.length ? true : false
    }
    // console.log(`${sign} ${coeff} ${variable}`)
    variable = variable.split('').sort().join('')
    if(coeff=='') coeff = 1
    coeff = parseInt(sign+coeff)
    if(!obj[variable]) obj[variable] = []
    obj[variable].push(coeff)
    i = index-1
  }

  let sorted = Object.keys(obj).sort((a,b)=>{
    return a<b ? -1 : 1
  })
  sorted = sorted.sort((a,b)=>{
    return a.length - b.length
  })
  sorted.forEach(key=>{
    ordered[key] = obj[key]
  })
  // console.log(sorted)
  Object.entries(ordered).forEach((entry,index)=>{
    let coeff = entry[1].reduce((a,b)=>a+b)
    if(!(coeff === 0)){
      if(coeff===-1) expr+= '-'+entry[0]
      else if(coeff<-1) expr+=coeff+entry[0]
      else if(coeff === 1 && index === 0) expr+=entry[0]
      else if(coeff===1 && index > 0) expr+='+'+entry[0]
      else if(coeff > 1 && index > 0) expr+='+'+coeff+entry[0]
      else expr+=coeff+entry[0]
    }
  })
  return expr
}