Vintage Linear Search

vintage-linear-search.js

const vintageLinearSearch = (data, target) => {
  for (let i in data) {
    if (data[i] === target) return i
  }
  return -1
}

console.log(vintageLinearSearch([1, 2, 3, 4], 1)) // 0
console.log(vintageLinearSearch([1, 2, 3, 4], 4)) // 3
console.log(vintageLinearSearch([1, 2, 3, 4], 6)) // -1
console.log(vintageLinearSearch([3, 4, 1, 6, 3], 6)) // 3