Experimenting autocomplete in js using Jaccard Similarity

autocomplete.js

const collection = ['food', 'car', 'paper', 'javascript', 'blockchain']

function search (keyword) {
  return collection.filter((val) => val.toLowerCase().includes(keyword.toLowerCase()))
}

function autocorrectSearch (keyword) {
  if (!search(keyword).length) {
    const output = collection.filter((val) => {
      const keywords = keyword.split('')
      const values = val.split('')
      const score = jaccardSimilarity1(keywords, values)
      const score2 = jaccardSimilarity2(keywords, values)
      console.log(score, score2)
      return score > 0.5
    })
    return output
  }
  return keyword
}

function jaccardSimilarity1 (arr1, arr2) {
  const union = [...new Set(arr1.concat(arr2))]
  const intersect = arr1.filter((val) => arr2.includes(val))
  return intersect.length / union.length
}
function jaccardSimilarity2 (arr1, arr2) {
  const uniqueA = [...new Set(arr1)]
  const uniqueB = [...new Set(arr2)]
  const union = [...new Set(uniqueA.concat(uniqueB))]
  const intersect = uniqueA.filter((val) => uniqueB.includes(val))
  return intersect.length / union.length
}
console.log('search:', search('jaa'))
console.log('autocorrect:', autocorrectSearch('blckch'))