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Tito Soft's questions

Martin Hope
Tito Soft
Asked: 2022-02-20 19:54:27 +0800 CST
  • 0

I wanted to make a query I have an Api that does GET POST AND PUT. My question, on flutter:

  1. I must always call them as a FUTURE to my methods that do GET or POST or PUT. I have tried them without putting them and it works "Normal".

  2. I also saw that some recommend using FUTURE in conjunction with FUTURE BUILDER to create the widgets. I have tried without using any of the 2 and it works "Normal".

  3. How should this scenario work where I combine update and read to my database from my API. I have been doing it like this I READ MY URL WITH THE DATA and show it on my screen, then with a button I call the method of my API that consults the states of those records (I get those states from another external API) and within this method that reads the states I call the method that does the UPDATE to update those states obtained in my database and within this same method I call the first method that showed me the documents (the one I initially use to show them on the mobile) but already with the "updated states". The Detail that returns me with the old states sometimes returns me some, for example there were 20 and it only shows me 5 (the other 15 have already updated their current state), with which I could conclude that my query method is carried out before it finishes updating the states. How can I control that?

I hope any comment or help on how to work correctly on those points thank you very much

api
Martin Hope
Tito Soft
Asked: 2022-02-15 14:19:20 +0800 CST
  • 0

I have this list:

data = [
{"serie" : "F001", "numero" : "1", "estado" : "1"},
{"serie" : "F001", "numero" : "2", "estado" : "1"},
{"serie" : "F001", "numero" : "3", "estado" : "1"},
{"serie" : "F001", "numero" : "4", "estado" : "1"}
]

I want to get this new list without the states:

dataNew = [
{"serie" : "F001", "numero" : "1"},
{"serie" : "F001", "numero" : "2"},
{"serie" : "F001", "numero" : "3"},
{"serie" : "F001", "numero" : "4"}
]

Thank you very much

lista
Martin Hope
Tito Soft
Asked: 2022-02-13 08:27:05 +0800 CST
  • 0

Good day.

Check, I have a

lista = {"A" : 100, "B" : 80, "C": 70, "D": 60, "E": 50, "F": 30}

What I want is to get a Mapwith the first 3 elements:

listaFinal = {"A" : 100, "B" : 80, "C": 70}

Can I only create mi listaFinal by making a to it foror is there another way to get the listaFinal ?

Additionally, there will be some way to add its elements without doing an forelement loop x.

I mean, get something like this

MapFinal2 = {"A" : 100, "B" : 80, "C": 70, "OTROS": 140}

Where "OTHERS" has the sum of "E", "F" and "G"

This code I am using to add:

var sum = lista.entries
  //.where((e) => e.key.startsWith('A'))
  .map<int>((e) => e.value)
  .reduce((a, b) => a + b);

But in the Where I don't know what to put so that I only add the first 3 or 4 elements of the Map. Additionally I would like to cut my first map and get only the first 3.

Thank you

flutter
Martin Hope
Tito Soft
Asked: 2022-02-06 17:55:56 +0800 CST
  • 2

Good morning, a question made me balls when I wanted to do the following I have this structure

Data = [
    {"id" : 1, "nombre" : "A", "cantidad" : 20},
    {"id" : 1, "nombre" : "A", "cantidad" : 30},
    {"id" : 2, "nombre" : "B", "cantidad" : 15},
    {"id" : 2, "nombre" : "B", "cantidad" : 10},
    {"id" : 3, "nombre" : "C", "cantidad" : 20}]

I want to get this result only from the id's without duplicate

R=[{"id" : 1}, {"id" : 2}, {"id" : 3}]either

R = [1, 2, 3]
lista