-1
I’m trying to extract the elements from a array and move on to
another array in the state more still unsuccessful, my code is like this:
this.state = {lista[]};
//(No metodo)
let v = "";
for(var j=0;j<=vetor.lenght-1;j++){
v = vetor[j];
this.state.setState((state) => { state.lista.concat(v); });
}
What I’m doing wrong?
0
Well, my approach to your problem would be as follows::
//(No construtor)
this.state = {lista : []};
//(No metodo)
let arr_temp = this.state.lista;
for(var j=0;j<=vetor.lenght-1;j++){
arr_temp.push(vetor[j])
}
arr_temp = [...arr_temp];
this.setState({lista: arr_temp})
You could also do this without it, using the spread to join the two arrays in a temporaria within the method, and then set the state, but it’s up to you
Did not function.... it returns list.lenght = 0.
Ué, return list.length where? try using a.log console like this: this.setState({list: arr_temp}, ()=>console.log(this.state.list))
I’m testing the result like this: console.log("LIST SIZE : "+this.state.list.length) and gives ZERO...
@Ninja2112 put the test in the callback of setstate, how did I answer there? just to make sure you’re getting the state dps of it change
Yes.... Same thing
strange, there is no complicated logic behind this code, it should be doing what you want. There is no problem with the variable vector by chance?
Browser other questions tagged javascript react
You are not signed in. Login or sign up in order to post.
Next guy copy a
arrayand create another or even add another is simple but, your current code does not help, could improve?– novic