Ok so you're saying that since it's memorized as reference I could copy the array - not the reference - generated by the .json() into a new variable and then use setList to insert the reference of the new object into the state, instead of directly setting it?
Yes you should always pass a new state to the set state and not mutate it i guess your useing a method somewhere that mutates the array stored in your state
Since hooks are based on functional principels you should be very careful with mutating your state
Const doesn’t prevent mutating an array or an object
Okay, new tests led to this:
Now when I console.log([...res]) the array shows both of the fields, but then when I setList([...res]); console.log(list) it shows only the first value... I have no idea of the reason.
I've created a pastebin with the whole code: pastebin.com/AAkyJusJ
Also this is the image of what my console is now:
Don't mind those errors as they're not about the code itself, but they're generated by react-md-components.
Ok so you're saying that since it's memorized as reference I could copy the array - not the reference - generated by the .json() into a new variable and then use setList to insert the reference of the new object into the state, instead of directly setting it?
Yes you should always pass a new state to the set state and not mutate it i guess your useing a method somewhere that mutates the array stored in your state
Since hooks are based on functional principels you should be very careful with mutating your state
Const doesn’t prevent mutating an array or an object
Okay, new tests led to this:
Now when I
console.log([...res])
the array shows both of the fields, but then when IsetList([...res]); console.log(list)
it shows only the first value... I have no idea of the reason.I've created a pastebin with the whole code: pastebin.com/AAkyJusJ
Also this is the image of what my console is now:
Don't mind those errors as they're not about the code itself, but they're generated by react-md-components.
the error is the following line since splice muatest the array
splice doc
const elem = list.splice(i, i + 1)[0];
btw you should run your fetch logic in a useEffect since it's a side effect
Ah! There's your problem on line 56:
The
splice
method is a mutator: it changes what's in yourlist
state!Here's the doc for details, but basically you need to use a different approach for extracting the element you want there.
I think
slice
should work:developer.mozilla.org/en-US/docs/W...
or even
const elem = list[i]
if I'm not mistaken
Yeah definitely! 👏
Oh God I though I was using .slice... All this trouble for a p.. I can't believe it.
Thanks to both of you, you were life saver, I would have probably rewritten the entire code to find this.