Tips for converting JSON or an object into an array for iteration:

I have a JavaScript application that makes an API call and receives JSON data in return. From this JSON data, I need to select a specific object and iterate through it.

The flow of my code is as follows: Service call -> GetResults Loop through Results and construct Page

The issue arises when the API returns only one result, resulting in an object instead of an array. This prevents me from looping through the results. How should I handle this situation?

Should I convert the object or single result into an array? Place/Push it inside an array? Or should I use typeof to determine if the element is an array before looping through it?

Thank you for your assistance.

//JSON data returned when there are multiple results
var results = {
pages: [
{"pageNumber": 204},
{"pageNumber": 1024},
{"pageNumber": 3012}
]
}

//JSON data returned when there is only one result
var results = {
pages: {"pageNumber": 105}
}

My code currently loops through the results using a for loop, but it encounters errors when results is not an array. Should I check if it's an array before proceeding? Should I push the results into a new array? What would be the best approach? Thank you

Answer №1

If the server side is beyond your control, one option is to perform a basic check to ensure the data is an array:

if (!(results.pages instanceof Array)) {
    results.pages = [results.pages];
}

// Implement your loop logic here.

Ideally, this validation should be handled on the server side as part of the agreement to ensure consistent data accessibility.

Answer №2

When working with objects inside a loop, consider organizing your actions into a separate procedure. If the object is not an array, apply the procedure directly. If it is an array, apply the procedure to each element of the array:

function processPage(page) { /* do something to your page */ }

if (pages instanceof Array) pages.forEach(processPage);
else processPage(pages);

One major advantage of this method over creating a redundant array is that it preserves the original data without unnecessary modifications. This can be crucial for maintaining data integrity during integration and regression tests.

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