Compare duplicates of images in arrays
let images1 = ["images/images/icon1.jpg", "images/images/icon2.jpg", "images/images/icon3.jpg", "images/images/icon4.jpg", "images/images/icon5.jpg", "images/images/icon6.jpg", "images/images/icon7.jpg", "images/images/icon8.jpg", "images/images/icon9.jpg", "images/images/icon10.jpg", "images/images/icon11.jpg", "images/images/icon12.jpg", "images/images/icon13.jpg", "images/images/icon14.jpg", "images/images/icon15.jpg", "images/images/icon16.jpg", "images/images/icon17.jpg", "images/images/icon18.jpg", "images/images/icon19.jpg", "images/images/icon20.jpg", "images/images/icon21.jpg", "images/images/icon22.jpg", "images/images/icon23.jpg", "images/images/icon24.jpg", "images/images/icon25.jpg", "images/images/icon26.jpg", "images/images/icon27.jpg", "images/images/icon28.jpg", "images/images/icon29.jpg", "images/images/icon30.jpg", "images/images/icon31.jpg", "images/images/icon32.jpg", "images/images/icon33.jpg", "images/images/icon34.jpg", "images/images/icon35.jpg", "images/images/icon36.jpg", "images/images/icon37.jpg", "images/images/icon38.jpg", "images/images/icon39.jpg", "images/images/icon40.jpg"]
let images2 = ["images/images/icon1.jpg", "images/images/icon2.jpg", "images/images/icon3.jpg", "images/images/icon4.jpg", "images/images/icon5.jpg", "images/images/icon6.jpg", "images/images/icon7.jpg", "images/images/icon8.jpg", "images/images/icon9.jpg", "images/images/icon10.jpg", "images/images/icon11.jpg", "images/images/icon12.jpg", "images/images/icon13.jpg", "images/images/icon14.jpg", "images/images/icon15.jpg", "images/images/icon16.jpg", "images/images/icon17.jpg", "images/images/icon18.jpg", "images/images/icon19.jpg", "images/images/icon20.jpg", "images/images/icon21.jpg", "images/images/icon22.jpg", "images/images/icon23.jpg", "images/images/icon24.jpg", "images/images/icon25.jpg", "images/images/icon26.jpg", "images/images/icon27.jpg", "images/images/icon28.jpg", "images/images/icon29.jpg", "images/images/icon30.jpg", "images/images/icon31.jpg", "images/images/icon32.jpg", "images/images/icon33.jpg", "images/images/icon34.jpg", "images/images/icon35.jpg", "images/images/icon36.jpg", "images/images/icon37.jpg", "images/images/icon38.jpg", "images/images/icon39.jpg", "images/images/icon40.jpg"]
function randomPair(array1, array2) {
// create an array of all the images, including the duplicates
const allImages = [...array1, ...array2]
let n = allImages.length;
let i, j;
// an empty array for the unique pairs
let uniquePairs = [];
for (i = 0; i < n; i++) {
for (j = i + 1; j < n; j++) {
// don't allow an image pair that contains 2 of the same image
if (allImages[i] !== allImages[j])
uniquePairs.push([allImages[i], allImages[j]])
}
}
// randomly choose a pair from the list of all unique pairs
let uniqueItem = uniquePairs[Math.floor(Math.random() * uniquePairs.length)];
console.log("There are " + uniquePairs.length + " unique combinations between the two arrays")
console.log("The returned unique pair is: " + uniqueItem.join(" + "))
return uniqueItem;
}
randomPair(images1, images2)I'm not sure if I am completely understanding your desired outcome, but why not approach it this way:
I'm understanding this as you want to compare 2 images chosen randomly, from 2 separate arrays that may include the same image, while avoiding comparing an image to itself.
This combines the two arrays, creates all of the possible pairs, filters out when any duplicates (image vs. itself), and returns a random pair.
From here you could display the combinations, and just make sure that the display itself does not duplicate. This isn't a truly random selection, but it randomly selects from all of the possible random combinations, so it should suffice.