Identify the distinct elements within the array following content validation

Given this basic array:

let result = ["doc1.rtf","doc2.rtf","test/doc4.rtf","test/doc4.rtf","test/doc6.rtf"]

To find unique occurrences, you can use the following:

let unique = [...new Set(result)];

This will give you:

["doc1.rtf","doc2.rtf","test/doc4.rtf","test/doc6.rtf"]

However, what you want is to search for unique items after filtering out any content up to leading slashes. So, before removing duplicates with test/, your array would look like this:

let filtered = ["doc1.rtf","doc2.rtf","test/","test/","test/"]

Is there a way to achieve this in one step? Any help would be appreciated.

javascriptarrays

Answer №1

Try using the map function to manipulate the results. Here is an example:

result.map(r => r.split('/')[0])
# ["doc1.rtf", "doc2.rtf", "test", "test", "test"]

result.map(r => r.replace(/\/.*/, '/'))
# ["doc1.rtf", "doc2.rtf", "test/", "test/", "test/"]

This approach may give you the desired outcome.

Answer №2

If you want to exclude everything before a forward slash, you can achieve this by utilizing the map function along with split:

let items = ["doc1.rtf","doc2.rtf","test/doc4.rtf","test/doc4.rtf","test/doc6.rtf"];
let result = items.map(item => item.split('/')[0]);
// ["doc1.rtf", "doc2.rtf", "test", "test", "test"]

Then, you can identify the unique elements in the array:

let uniqueElements = [...new Set(result)];
//["doc1.rtf", "doc2.rtf", "test"]

Answer №3

To efficiently filter the array in one go, you can map each item to a resolver and then use a Set to check for uniqueness.

const uniqueMapping = resolver => function getUniqueItems(array) {
  const existingItems = new Set(),
    resultArray = []
  for (let index = 0; index < array.length; index++) {
    const element = array[index]
    const resolvedElement = resolver(element)
    if (existingItems.has(resolvedElement)) {
      continue
    }
    existingItems.add(resolvedElement)
    resultArray.push(resolvedElement)
  }
  return resultArray
}

let dataArray = ["doc1.rtf","doc2.rtf","test/doc4.rtf","test/doc4.rtf","test/doc6.rtf"]

console.log(
  uniqueMapping(item => item.split('/')[0])(dataArray),
) // [ 'doc1.rtf', 'doc2.rtf', 'test' ]

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