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/ 11 Years ago, sat, april 13, 2013, 12:00:00
I am working with a JSON object which can have a property ids at any leaf. I want to traverse the object and find all of the instances of the ids property and store each id in a collection.
Mocked up JSON Object (the ids property could be at much deeper property locations).
{
id: b38a683d-3fb6-408f-9ef6-f4b853ed1193,
foo: {
ids: [
{
id: bd0bf3bd-d6b9-4706-bfcb-9c867e47b881
},
{
id: d1cc529d-d5d2-4460-b2bb-acf24a7c5999
},
{
id: b68d0c8c-548e-472f-9b01-f25d4b199a71
}
],
baz: super
},
bar: {
ids: [
{
id: bd0bf3bd-d6b9-4706-bfcb-9c867e47b881
},
{
id: d1cc529d-d5d2-4460-b2bb-acf24a7c5999
},
{
id: b68d0c8c-548e-472f-9b01-f25d4b199a71
}
]
}
}
I am using the following code to traverse the above JSON.
var jsonFile = require('./file_test.json'); // the above in my local directory
function traverse(obj, ids) {
for (var prop in obj) {
if (typeof obj[prop] == object && obj[prop]) {
if (prop == 'ids') {
for (var i = obj[prop].length - 1; i >= 0; i--) {
ids.push(obj[prop][i]._id);
};
}
traverse(obj[prop], ids);
}
}
}
var ids = new Array();
traverse(jsonFile, ids);
console.log('ids', ids);
The above nets the following:
ids
[
'b68d0c8c-548e-472f-9b01-f25d4b199a71',
'd1cc529d-d5d2-4460-b2bb-acf24a7c5999',
'bd0bf3bd-d6b9-4706-bfcb-9c867e47b881',
'b68d0c8c-548e-472f-9b01-f25d4b199a71',
'd1cc529d-d5d2-4460-b2bb-acf24a7c5999',
'bd0bf3bd-d6b9-4706-bfcb-9c867e47b881'
]
While my code works I am not convinced that I am doing this the most efficient or best way. Is there a better way to find all instances of the ids property? Perhaps without passing in an array but returning one? Or setting up for a callback with an ids array?
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