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How to Create a Hierarchical Property List from Complex Objects Recursively in JavaScript?
How to Create a Hierarchical Property List from Complex Objects Recursively in JavaScript?
Oct 20, 2024 pm 02:29 PM
Creating a Hierarchical Property List from Complex Objects Recursively
In situations where complex objects contain multiple sub-objects and properties with varying data types, the need arises to build a hierarchical list of those properties. To achieve this, a recursive looping approach is essential.
Given Problem:
An object is provided with the following structure:
<code class="javascript">var object = {
aProperty: {
aSetting1: 1,
aSetting2: 2,
aSetting3: 3,
aSetting4: 4,
aSetting5: 5
},
bProperty: {
bSetting1: {
bPropertySubSetting : true
},
bSetting2: "bString"
},
cProperty: {
cSetting: "cString"
}
};</code>
Desired Output:
The goal is to create a list of keys that accurately reflects the hierarchy of the object:
aProperty.aSetting1 aProperty.aSetting2 aProperty.aSetting3 aProperty.aSetting4 aProperty.aSetting5 bProperty.bSetting1.bPropertySubSetting bProperty.bSetting2 cProperty.cSetting
Initial Solution:
<code class="javascript">function iterate(obj) {
for (var property in obj) {
if (obj.hasOwnProperty(property)) {
if (typeof obj[property] == "object") {
iterate(obj[property]);
}
else {
console.log(property + " " + obj[property]);
}
}
}
}</code>
This function loops through the object and prints the keys, but it does not maintain the hierarchy.
Recursive Solution:
To preserve the hierarchy, we can maintain a stack string that represents the path of the current property. When a primitive property is encountered, the path is printed. For nested objects, the stack is updated, and the recursion continues.
<code class="javascript">function iterate(obj, stack) {
for (var property in obj) {
if (obj.hasOwnProperty(property)) {
if (typeof obj[property] == "object") {
iterate(obj[property], stack + '.' + property);
} else {
console.log(property + " " + obj[property]);
$('#output').append($("<div/>").text(stack + '.' + property))
}
}
}
}
iterate(object, '');</code>
Additional Notes:
- This solution maintains the same object structure but appends the complete path to the output list.
- For a more elegant solution that separates the hierarchy from the data, refer to another answer.
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