How do I go through an array of names using the filter function of javascript where the return is just the names of people with the surname "Carvalho"?
Example:
let nomes = ["Thiago Carvalho", "Renata Carvalho", "Alexandre Otoni", "Guilherme Otoni de Carvalho"];
nomes.filter(item => ???);
You can use the .includes() method in the filter . This method has been implemented in ECMAScript 2015 (ES6) , and works similar to the old indexOf :
let nomes = ["Thiago Carvalho", "Renata Carvalho", "Alexandre Otoni", "Guilherme Otoni de Carvalho"];
let filtro = nomes.filter(item => item.includes("Carvalho"));
console.log(filtro); Assuming the surname is the last name, you can split the names with split(" ") and get the last one with slice(-1) and check if it's what you want:
let nomes = ["Thiago Carvalho", "Renata Carvalho", "Alexandre Otoni", "Guilherme Otoni de Carvalho"];
let filtro = "Carvalho";
let nomesFiltrados = nomes.filter(item => item.split(" ").slice(-1) == filtro);
console.log(nomesFiltrados);If you want to use regular expressions , here's an example of how do it:
const nomes = ['Thiago Carvalho', 'Renata Carvalho', 'Alexandre Otoni', 'Guilherme Otoni de Carvalho'];
const filtro = 'Carvalho';
const nomesFiltrados = nomes.filter(item => (new RegExp(filtro)).test(item));
console.log(nomesFiltrados);Documentation for the methods used: