function isValidParentheses(expression: string): boolean {
  const expArr = expression.split('')
  let resp = false
  expArr.map( (char, i) => {
    switch(char){
      case '{':
      if(expArr[i+1] === '}')
      resp = true
      break;
      case '[':
      if(expArr[i+1] === ']')
      resp = true
      break;
      case '(':
      if(expArr[i+1] === ')')
      resp = true
      break;
    }
  })
  return resp;
}

// No modificar: necesario para evaluar el resultado.
export { isValidParentheses };