Add .distinct method to reduce result to unique terms/dataset/graph

[bergos]

After traversing a graph, many times there are duplicates. Sometimes this is wanted (e.g. counting matching pathes), so it can't be the default, but many times only the unique set is required.

A .distinct method should be added that returns a new object with a reduced context with unique terms/dataset/graph.

[l00mi]

From thomasz:

const map = graph
  .toArray()
  .reduce((distinct, node) => {
    if (distinct.has(node.value) === false) {
      distinct.set(node.value, node)
    }

    return distinct
  }, new Map())

const distinct = [...map.values()]

[tpluscode]

This is just a workaround, because it returns an array of clownface with single context

The real deal should return a single object with distinct terms/values

[bergos]

Here is a simple version of it that only checks the terms.

The implementation for clownface should by default check term, dataset and graph of the context. It should be possible to pass arguments to check only specific parts. E.g.:

This would check only dataset and graph:

cf.distinct({ dataset: true, graph: true })