I'm lost, where is the code logic?
const contatos = [
{
nome: 'Alex Júnior',
numero: '1234-5678'
},
{
nome: 'Carolina Moya',
numero: '1234-6789'
},
{
nome: 'Fernando Jorge',
numero: '12345-5567'
}
];
const [, Carol] = contatos; // Não entendi esse trecho
function mostraNumero({numero}){
console.log(numero)
}
mostraNumero(Carol);What is the purpose of the const stretch, [Carol] = contacts, I could not understand?
This is called Assignment via destructuring . In this case, the code snippet declares the variable Carol, which will get the second position of the array that was passed, so the [, Carol] notation. This is similar to doing: const Carol = contatos[1] .
Remember that this is an addition to ES6, so it may not be available in all browsers.
EDIT: Making one more addition, to make it even clearer. In the example that you put, we could also do:
const contatos = [
{
nome: 'Alex Júnior',
numero: '1234-5678'
},
{
nome: 'Carolina Moya',
numero: '1234-6789'
},
{
nome: 'Fernando Jorge',
numero: '12345-5567'
}
];
const [Alex , Carol] = contatos; // Não entendi esse trecho
function mostraNumero({numero}){
console.log(numero)
}
mostraNumero(Carol);
mostraNumero(Alex);
That would be equivalent to doing:
const Alex = contatos[0];
const Carol = contatos[1];