JS Duplicates

removeDuplicates.js

function cheapStringify(object) {
  if (typeof object !== 'object' || object === null) {
    if (typeof object === 'string') {
      return `"${object.replace(/"/g, '\\"')}"`
    }
    return String(object)
  }
  let result = '{'
  for (const key in object) {
    result += `"${key.replace(/"/g, '\\"')}":${stringify(object[key])},`
  }
  result = `${result.slice(0, -1)}}`
  return result
}

function removeDuplicates(objects, keys) {
    const seen = new Set()
    return objects.filter(object => {
        const values = keys.map(key => {
            if (typeof object[key] === 'object') {
                return cheapStringify(object[key])
            } else {
                return object[key]
            }
        })
        const valueString = values.join('|')
        if (seen.has(valueString)) {
            return false
        }

        seen.add(valueString)
        return true
    })
}