Insert an item into a convoluted array

Question

Insert an item into a convoluted array

I'm struggling to insert an Object into a complex array. My attempt looks like this: "DUMMY_PLACES[0].todos.byIds.push," but I am unable to make it work. I have an id and content for the object, and the completed property should default to false. I hope someone can help me with this seemingly simple task that I can't seem to figure out. Additionally, I would appreciate any assistance with implementing the delete option.

For example, I have (5, test5), and I want to achieve the desired outcome.

     const DUMMY_PLACES = [
          {
            todos: {
              allIds: [1, 2, 3, 4,],
              byIds: {
                "1": {
                  content: "test1",
                  completed: false,
                },
                "2": {
                  content: "test2",
                  completed: false,
                },
                "3": {
                  content: "test3\\",
                  completed: false,
                },
                "4": {
                  content: "test4",
                  completed: false,
                },
              },
            },
            visibilityFilter: "all",
          },
        ];

 const DUMMY_PLACES = [
      {
        todos: {
          allIds: [1, 2, 3, 4,5],
          byIds: {
            "1": {
              content: "test1",
              completed: false,
            },
            "2": {
              content: "test2",
              completed: false,
            },
            "3": {
              content: "test3\\",
              completed: false,
            },
            "4": {
              content: "test4",
              completed: false,
            },
            "5": {
              content: "test5",
              completed: false,
            },
          },
        },
        visibilityFilter: "all",
      },
    ];

javascript arrays push

Answer 1

Answer №1

Explore the addTodo function below, which adds a new element to the end of a new instance of the todoList and updates the list of Ids. Each line is extensively commented for easy understanding.

let todoList = [
  {
    todos: {
      allIds: [1, 2, 3, 4],
      byIds: {
        "1": {
          content: "test1",
          completed: false,
        },
        "2": {
          content: "test2",
          completed: false,
        },
        "3": {
          content: "test3",
          completed: false,
        },
        "4": {
          content: "test4",
          completed: false,
        },
      },
    },
    visibilityFilter: "all",
  },
];

let addTodo = (sourceArray, el) => {
  // Create a copy of the original array
  let targetArray = [];
  Object.assign(targetArray, sourceArray);

  let todos = targetArray[0].todos;

  // Calculate the Id for the new element
  let newId = Object.keys(todos.byIds).length + 1;

  // Add the new Id to the `allIds` list
  todos.allIds.push(newId);

  // Create the new element
  todos.byIds[newId] = {
    content: el,
    completed: false
  }

  return targetArray;
}

todoList = addTodo(todoList, 'test5');
todoList = addTodo(todoList, 'test6');
todoList = addTodo(todoList, 'test7');

console.log(JSON.stringify(todoList));

The expected output will be:

[
  {
    "todos":{
      "allIds":[
        1,
        2,
        3,
        4,
        5,
        6,
        7
      ],
      "byIds":{
        "1":{
          "content":"test1",
          "completed":false
        },
        "2":{
          "content":"test2",
          "completed":false
        },
        "3":{
          "content":"test3",
          "completed":false
        },
        "4":{
          "content":"test4",
          "completed":false
        },
        "5":{
          "content":"test5",
          "completed":false
        },
        "6":{
          "content":"test6",
          "completed":false
        },
        "7":{
          "content":"test7",
          "completed":false
        }
      }
    },
    "visibilityFilter":"all"
  }
]

Answer 2

Explore the addTodo function below, which adds a new element to the end of a new instance of the todoList and updates the list of Ids. Each line is extensively commented for easy understanding.

let todoList = [
  {
    todos: {
      allIds: [1, 2, 3, 4],
      byIds: {
        "1": {
          content: "test1",
          completed: false,
        },
        "2": {
          content: "test2",
          completed: false,
        },
        "3": {
          content: "test3",
          completed: false,
        },
        "4": {
          content: "test4",
          completed: false,
        },
      },
    },
    visibilityFilter: "all",
  },
];

let addTodo = (sourceArray, el) => {
  // Create a copy of the original array
  let targetArray = [];
  Object.assign(targetArray, sourceArray);

  let todos = targetArray[0].todos;

  // Calculate the Id for the new element
  let newId = Object.keys(todos.byIds).length + 1;

  // Add the new Id to the `allIds` list
  todos.allIds.push(newId);

  // Create the new element
  todos.byIds[newId] = {
    content: el,
    completed: false
  }

  return targetArray;
}

todoList = addTodo(todoList, 'test5');
todoList = addTodo(todoList, 'test6');
todoList = addTodo(todoList, 'test7');

console.log(JSON.stringify(todoList));

The expected output will be:

[
  {
    "todos":{
      "allIds":[
        1,
        2,
        3,
        4,
        5,
        6,
        7
      ],
      "byIds":{
        "1":{
          "content":"test1",
          "completed":false
        },
        "2":{
          "content":"test2",
          "completed":false
        },
        "3":{
          "content":"test3",
          "completed":false
        },
        "4":{
          "content":"test4",
          "completed":false
        },
        "5":{
          "content":"test5",
          "completed":false
        },
        "6":{
          "content":"test6",
          "completed":false
        },
        "7":{
          "content":"test7",
          "completed":false
        }
      }
    },
    "visibilityFilter":"all"
  }
]

Answer 3

Answer №2

Perhaps a solution like this could work for you

const DUMMY_PLACES = [ { todos: { allIds: [1, 2, 3, 4], byIds: { "1": { content: "test1", completed: false, }, "2": { content: "test2", completed: false, }, "3": { content: "test3\\", completed: false, }, "4": { content: "test4", completed: false, }, }, }, visibilityFilter: "all", }, ];

function addObject(id, content) {
  DUMMY_PLACES[0].todos.allIds.push(id);
  DUMMY_PLACES[0].todos.byIds[id] = { ...content, completed: false };
}
addObject(5, { content: "test5" });
console.dir(DUMMY_PLACES);

Answer 4

Perhaps a solution like this could work for you

const DUMMY_PLACES = [ { todos: { allIds: [1, 2, 3, 4], byIds: { "1": { content: "test1", completed: false, }, "2": { content: "test2", completed: false, }, "3": { content: "test3\\", completed: false, }, "4": { content: "test4", completed: false, }, }, }, visibilityFilter: "all", }, ];

function addObject(id, content) {
  DUMMY_PLACES[0].todos.allIds.push(id);
  DUMMY_PLACES[0].todos.byIds[id] = { ...content, completed: false };
}
addObject(5, { content: "test5" });
console.dir(DUMMY_PLACES);

Answer 5

Answer №3

Your code could benefit from implementing encapsulation. A recommended approach would be to create a new class with setters.

UPDATE with an example:

class UserTodoList
{
    constructor( visibilityFilter = 'all' )
    {
        this._visibilityFilter  = visibilityFilter;
        this._todosByIds        = new Map();
    }

    addTodo( title, content )
    {
        const value = {
            content,
            completed: false
        }
        this._todosByIds.set( title, value );
    }

    getTodo( title )
    {
        return this._todosByIds.get( title );
    }

    completeTodo( title )
    {
        this._todosByIds.get( title ).completed  = true;
    }

    deleteTodo( title )
    {
        this._todosByIds.delete( title );
    }

    getAllTodoIds()
    {
        return Array.from( this._todosByIds.keys() );
    }

    getVisibilityFilter()
    {
        return this._visibilityFilter;
    }

    // Implement other getters
}

const TODO_LIST = [];
TODO_LIST.push( new UserTodoList( 'all' ) );

const todoTitle = 'Some Title';

TODO_LIST[0].addTodo( todoTitle, 'Do Something' );

console.log( TODO_LIST[0].getTodo( todoTitle ) );

TODO_LIST[0].completeTodo( todoTitle );

console.log( TODO_LIST[0].getTodo( todoTitle ) );

Answer 6

Your code could benefit from implementing encapsulation. A recommended approach would be to create a new class with setters.

UPDATE with an example:

class UserTodoList
{
    constructor( visibilityFilter = 'all' )
    {
        this._visibilityFilter  = visibilityFilter;
        this._todosByIds        = new Map();
    }

    addTodo( title, content )
    {
        const value = {
            content,
            completed: false
        }
        this._todosByIds.set( title, value );
    }

    getTodo( title )
    {
        return this._todosByIds.get( title );
    }

    completeTodo( title )
    {
        this._todosByIds.get( title ).completed  = true;
    }

    deleteTodo( title )
    {
        this._todosByIds.delete( title );
    }

    getAllTodoIds()
    {
        return Array.from( this._todosByIds.keys() );
    }

    getVisibilityFilter()
    {
        return this._visibilityFilter;
    }

    // Implement other getters
}

const TODO_LIST = [];
TODO_LIST.push( new UserTodoList( 'all' ) );

const todoTitle = 'Some Title';

TODO_LIST[0].addTodo( todoTitle, 'Do Something' );

console.log( TODO_LIST[0].getTodo( todoTitle ) );

TODO_LIST[0].completeTodo( todoTitle );

console.log( TODO_LIST[0].getTodo( todoTitle ) );

Insert an item into a convoluted array

Answer №1

Answer №2

Answer №3

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