Ways to extract the initial image from a loop?

Feeling a bit weary, I have been struggling to find a solution to a current issue of mine.

My task involves utilizing Tumblr's API to access specific blogs and retrieve posts from them. Each post contains a title, an image, and a website link. My approach includes iterating over the API's JSON data and storing the titles in a title array, image links in an image array, and website links in a links array. The plan is to match each post with its respective image and link by using the arrays like this: title[1], image[1], links[1]. However, the problem arises when some blog posts contain 2-3 images instead of just one. As a result, the length of my arrays differs – title: 91, links: 91, image: 120. This discrepancy leads to mismatched pairings where an image from one post may be linked to the title and link of another post.

The title and links arrays function correctly, but the issue lies within the image array. Is there a way for me to modify the code so that only the first picture is fetched? Despite reviewing the documentation, I couldn't find a suitable solution.

Code:

$(data.response.posts).each(function(index, value){
if(value.type === "photo"){
    try{
        var newLink = value.source_url; 
        var newTitle = value.slug; 

        if(checkIfNotExists(newLink, links) && checkIfNotExists(newTitle, titles)){
            links.push(newLink);
            titles.push(newTitle); 
        }

        $(value.photos).each(function(idx, val){
            var newImage = val.original_size.url; 
            if(checkIfNotExists(newImage, images)){
                images.push(newImage); 
            }
        });
    }catch(err){
        console.log("err"); 
    }

}

//Function to ensure no duplicate
function checkIfNotExists(checkValue, fullArray){
    if(fullArray.indexOf(checkValue)>-1 && checkValue!=='undefined' && checkValue!==undefined && checkValue!=='default'){
        return true; 
    }else{
        return false; 
    }
}

Any assistance on resolving this issue would be greatly appreciated.

Answer №1

To start off, it is important to verify that no items are added to the arrays until all checkIfNotExists functions have confirmed they return true. Otherwise, the indexes may become mismatched.

Regarding selecting the initial image, a possible approach could be:

$(data.response.posts).each(function(index, value) {
    if(value.type !== "photo")
        return;

    var newLink = value.source_url; 
    var newTitle = value.slug; 

    // Ensure link uniqueness
    if(!checkIfNotExists(newLink, links))
        return;

    // Ensure title uniqueness
    if(!checkIfNotExists(newTitle, titles))
        return;

    // Locate the first unique image
    var newImage = null;
    for(var i = 0; !newImage && i < value.photos.length; ++i) {
        if(checkIfNotExists(value.photos[i].original_size.url, images))
            newImage = value.photos[i].original_size.url;
    }

    // Verify an image was found
    if(!newImage)
        return;

    // All checks passed, add the values!
    links.push(newLink);
    titles.push(newTitle);
    images.push(newImage);
});

Answer №2

After a thorough investigation, I successfully resolved the issue at hand! It became apparent that the root cause lay in the way I was iterating through the data. By restructuring my code to ensure that thumbnail iterations aligned with links and titles, the problem was eradicated. Here is how I reorganized the try block:

var newLink = value.source_url; 
var newTitle = value.slug; 

if(checkIfNotExists(newLink, links) && checkIfNotExists(newTitle, titles)){
    $(value.photos).each(function(idx, val){
        var newImage = val.original_size.url; 
        if(checkIfNotExists(newImage, images)){
            images.push(newImage); 
            links.push(newLink);
            titles.push(newTitle);

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