How to parse from one list of objects to another?

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How to parse from one list of objects to another?

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#1 by (1 votes)

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I have a task list stored in an object items , I want to parse this list so that everything with open status is stored in the openTasks variable and everything is with status completed is stored in completedTasks .

I even scribbled something but it did not work. See:

export class AllTasksPage {

  openTasks;
  completedTasks;

  items = [
    {'title': 'Entregar relatório', 'note': '', 'image': '', 'status': 'aberta'},
    {'title': 'Fazer compras', 'note': '', 'image': '', 'status': 'aberta'},
    {'title': 'Concluir trabalho da faculdade', 'note': '', 'image': '', 'status': 'concluida'},
    {'title': 'Ligar para cliente', 'note': '', 'image': '', 'status': 'concluida'},
    {'title': 'Revisar trabalho', 'note': '', 'image': '', 'status': 'aberta'},
    {'title': 'Falar com chefe', 'note': '', 'image': '', 'status': 'concluida'},
    {'title': 'Estudar apra prova', 'note': '', 'image': '', 'status': 'aberta'},
    {'title': 'Buscar roupa na lavanderia', 'note': '', 'image': '', 'status': 'aberta'},
    {'title': 'Limpar a casa', 'note': '', 'image': '', 'status': 'aberta'},
    {'title': 'Estudar para apresentação', 'note': '', 'image': '', 'status': 'aberta'},
    {'title': 'Assistir filme xpto', 'note': '', 'image': '', 'status': 'aberta'},
    {'title': 'Colocar a roupa para lavar', 'note': '', 'image': '', 'status': 'aberta'}
  ];

  constructor(public navCtrl: NavController, public alertCtrl: AlertController) {

    for (let item of this.items) {
      if (item.status == 'aberta') {
        this.openTasks.concat(item);
      }
    }
  }

In short, I want openTasks and comletedTasks to have the same structure as items , but data will change based on task status.

javascript typescript

asked by anonymous 22.09.2018 / 21:16

1 answer

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score 1 · Accepted Answer

You can use Array.prototype.filter() to filter items of an array.

const items = [
  {'title': 'Entregar relatório', 'note': '', 'image': '', 'status': 'aberta'},
  {'title': 'Fazer compras', 'note': '', 'image': '', 'status': 'aberta'},
  {'title': 'Concluir trabalho da faculdade', 'note': '', 'image': '', 'status': 'concluida'},
  {'title': 'Ligar para cliente', 'note': '', 'image': '', 'status': 'concluida'},
  {'title': 'Revisar trabalho', 'note': '', 'image': '', 'status': 'aberta'},
  {'title': 'Falar com chefe', 'note': '', 'image': '', 'status': 'concluida'},
  {'title': 'Estudar apra prova', 'note': '', 'image': '', 'status': 'aberta'},
  {'title': 'Buscar roupa na lavanderia', 'note': '', 'image': '', 'status': 'aberta'},
  {'title': 'Limpar a casa', 'note': '', 'image': '', 'status': 'aberta'},
  {'title': 'Estudar para apresentação', 'note': '', 'image': '', 'status': 'aberta'},
  {'title': 'Assistir filme xpto', 'note': '', 'image': '', 'status': 'aberta'},
  {'title': 'Colocar a roupa para lavar', 'note': '', 'image': '', 'status': 'aberta'}
];

const filterByStatus = (status) => {
  return items.filter((item) => item.status === status);
};

const onlyOpened = filterByStatus("aberta");
const onlyCompleted = filterByStatus("concluida");

console.log("Only opened", onlyOpened);
console.log("Only completed", onlyCompleted);

The method has no side effects, and returns a new filtered array.