const texto = '1π3π5π7π9';
const caracteres = [...texto]; //Separa a string em um arrary de caracteres
console.log(caracteres.slice(0, 8).join("")+ '...'); //extrai uma porção de caracteres do array e os junta novamente em string
Y29uc3QgdGV4dG8gPSAnMfCfmIAz8J+YgTXwn5iCN/CfmIM5JzsKCgpjb25zdCBjYXJhY3RlcmVzID0gWy4uLnRleHRvXTsgICAgLy9TZXBhcmEgYSBzdHJpbmcgZW0gdW0gYXJyYXJ5IGRlIGNhcmFjdGVyZXMKCgpjb25zb2xlLmxvZyhjYXJhY3RlcmVzLnNsaWNlKDAsIDgpLmpvaW4oIiIpKyAnLi4uJyk7IC8vZXh0cmFpIHVtYSBwb3LDp8OjbyBkZSBjYXJhY3RlcmVzIGRvIGFycmF5IGUgb3MganVudGEgbm92YW1lbnRlIGVtIHN0cmluZwo=