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import {assocPath} from './assocPath'import {path as pathModule} from './path'const ALLOWED_OPERATIONS = ['remove', 'add', 'update']
export function removeAtPath(path, obj) {  const p = typeof path === 'string' ? path.split('.') : path
  const len = p.length  if (len === 0) return  if (len === 1) return delete obj[p[0]]  if (len === 2) return delete obj[p[0]][p[1]]  if (len === 3) return delete obj[p[0]][p[1]][p[2]]  if (len === 4) return delete obj[p[0]][p[1]][p[2]][p[3]]  if (len === 5) return delete obj[p[0]][p[1]][p[2]][p[3]][p[4]]  if (len === 6) {    return delete obj[p[0]][p[1]][p[2]][p[3]][p[4]][p[5]]  }  if (len === 7) {    return delete obj[p[0]][p[1]][p[2]][p[3]][p[4]][p[5]][p[6]]  }  if (len === 8) {    return delete obj[p[0]][p[1]][p[2]][p[3]][p[4]][p[5]][p[6]][p[7]]  }  if (len === 9) {    return delete obj[p[0]][p[1]][p[2]][p[3]][p[4]][p[5]][p[6]][p[7]][p[8]]  }  if (len === 10) {    return delete obj[p[0]][p[1]][p[2]][p[3]][p[4]][p[5]][p[6]][p[7]][p[8]][      p[9]    ]  }}
export function applyDiff(rules, obj) {  if (arguments.length === 1) return _obj => applyDiff(rules, _obj)
  let clone = {...obj}
  rules.forEach(({op, path, value}) => {    if (!ALLOWED_OPERATIONS.includes(op)) return    if (op === 'add' && path && value !== undefined) {      if (pathModule(path, obj)) return
      return (clone = assocPath(path, value, clone))    }
    if (op === 'remove') {      if (pathModule(path, obj) === undefined) return
      return removeAtPath(path, clone)    }    if (op === 'update' && path && value !== undefined) {      if (pathModule(path, obj) === undefined) return
      return (clone = assocPath(path, value, clone))    }  })
  return clone}