Utilize recursive and for loop methods for parsing JSON efficiently

Question

Utilize recursive and for loop methods for parsing JSON efficiently

I have a JSON file that requires parsing. I'm attempting to implement a recursive method for this task. The current JSON data is structured as shown below:

Item 01
 SubItem 01
  InnerSubItem 01

Item 02
 SubItem 01
  InnerSubItem 01

Unfortunately, the function I wrote only manages to parse the first set of data (The contents under Item 01). It seems like the code does not loop back when the condition is false.

Here is the code snippet I used:

$.getJSON('https://api.myjson.com/bins/6atbz', function(data) {
  repeat(data, data.layers);
})

function repeat(data, x) {
  var layer = data.layers.reverse()
  for (i = 0; i < x.length; i++) {
    name = x[i].name
    console.log(name)
    if (x[i].layers.length > 0) {
      repeat(data, x[i].layers)
    }
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

javascript json

Answer 1

Answer №1

You may encounter issues with your code if the object does not have a layers property. It is important to first check for its existence before proceeding to check for length.

For example:

if (x[i].layers && x[i].layers.length > 0)

Here is the revised code:

$.getJSON('https://api.myjson.com/bins/6atbz', function(data) {
  repeat(data, data.layers);
})

function repeat(data, x) {
  var layer = data.layers.reverse();
  for (var i = 0; i < x.length; i++) {
    name = x[i].name;
    console.log(name);
    if (x[i].layers && x[i].layers.length > 0) {
      repeat(data, x[i].layers);
    }
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Additionally, it appears that you are not using the reversed array and are passing data unnecessarily each time repeat is called. Consider simplifying the code as follows (reverse the array if needed):

$.getJSON('https://api.myjson.com/bins/6atbz', function(data) {
  repeat(data);
})

function repeat(data) {
  if (!data || !data.layers)
    return;

  var x = data.layers;
  for (var i = 0; i < x.length; i++) {
    name = x[i].name;
    console.log(name);
    repeat(x[i]);
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Answer 2

You may encounter issues with your code if the object does not have a layers property. It is important to first check for its existence before proceeding to check for length.

For example:

if (x[i].layers && x[i].layers.length > 0)

Here is the revised code:

$.getJSON('https://api.myjson.com/bins/6atbz', function(data) {
  repeat(data, data.layers);
})

function repeat(data, x) {
  var layer = data.layers.reverse();
  for (var i = 0; i < x.length; i++) {
    name = x[i].name;
    console.log(name);
    if (x[i].layers && x[i].layers.length > 0) {
      repeat(data, x[i].layers);
    }
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Additionally, it appears that you are not using the reversed array and are passing data unnecessarily each time repeat is called. Consider simplifying the code as follows (reverse the array if needed):

$.getJSON('https://api.myjson.com/bins/6atbz', function(data) {
  repeat(data);
})

function repeat(data) {
  if (!data || !data.layers)
    return;

  var x = data.layers;
  for (var i = 0; i < x.length; i++) {
    name = x[i].name;
    console.log(name);
    repeat(x[i]);
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Utilize recursive and for loop methods for parsing JSON efficiently

Answer №1

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