What is the best way to add new key value pairs to the dictionary?

Question

What is the best way to add new key value pairs to the dictionary?

I am attempting to distinguish between single clicks (assigned value 0) and double clicks (assigned value 1), while also keeping a log of the click and its position in a map. However, I have noticed that the keys are automatically sorted in ascending order, even though I did not intentionally sort them. Is there a way to incorporate the position key along with the corresponding value of 1 or 0 at the end while ensuring that all clicks are properly recorded? I even attempted converting the key to a string using String(i).

If you'd like to see the entire code for the project I'm currently working on, it can be found here: Codesandbox

var lastClicked;
var map = {};

var grid = clickableGrid(20, 30, function(el, row, col, i, isDoubleClick) {

  if (!isDoubleClick && !el.className) {
    el.className = "clicked";
    map[String(i)] = 0;
  } else if (isDoubleClick && !el.className) {
    el.className = "niclicked";
    map[String(i)] = 1;
  }
  console.log(map);
});

document.body.appendChild(grid);

javascript html css object

Answer 1

Answer №1

It's important to note that the order in which keys are visited in plain objects during iteration is not guaranteed to be based on insertion-order. Positive integers within the 32-bit range are visited in numerical order.

For maintaining insertion order, arrays are a good option as they follow the sequence of elements added using push. However, unlike dictionaries, they do not support key-based entry retrieval.

If you require both dictionary behavior and insertion order preservation, utilizing a Map can be beneficial:

var lastClicked;
var map = new Map; // <---

var grid = clickableGrid(20, 30, function(el, row, col, i, isDoubleClick) {

  if (!isDoubleClick && !el.className) {
    el.className = "clicked";
    map.set(i, 0);
  } else if (isDoubleClick && !el.className) {
    el.className = "niclicked";
    map.set(i, 1);
  }
  map.forEach((value, key) => console.log(key, value)); //<-- insertion order!
});

document.body.appendChild(grid);

You can use: map.get(key) to efficiently retrieve the 0/1 value associated with a specific key, similar to a plain object.

Answer 2

It's important to note that the order in which keys are visited in plain objects during iteration is not guaranteed to be based on insertion-order. Positive integers within the 32-bit range are visited in numerical order.

For maintaining insertion order, arrays are a good option as they follow the sequence of elements added using push. However, unlike dictionaries, they do not support key-based entry retrieval.

If you require both dictionary behavior and insertion order preservation, utilizing a Map can be beneficial:

var lastClicked;
var map = new Map; // <---

var grid = clickableGrid(20, 30, function(el, row, col, i, isDoubleClick) {

  if (!isDoubleClick && !el.className) {
    el.className = "clicked";
    map.set(i, 0);
  } else if (isDoubleClick && !el.className) {
    el.className = "niclicked";
    map.set(i, 1);
  }
  map.forEach((value, key) => console.log(key, value)); //<-- insertion order!
});

document.body.appendChild(grid);

You can use: map.get(key) to efficiently retrieve the 0/1 value associated with a specific key, similar to a plain object.

What is the best way to add new key value pairs to the dictionary?

Answer №1

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