Comparing two arrays of objects in Javascript to identify common values and implement modifications

var nickNames = [
  {
    nickName:"Father",
    emailAddress:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ec888d88ac888d88c28f8381">[email protected]</a>",
  },
  {
    nickName:"Mother",
    emailAddress:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ff929092bf929092d19c9092">[email protected]</a>",
  },
  {
    nickName:"Bestie",
    emailAddress:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="77151111371511115914181a">[email protected]</a>",
  }
]

var emails = [
  {
    from:"Dad Dadson <<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="30545154705451541e535f5d">[email protected]</a>>"
  },
  {
    from:"Mom Dadson <<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="7815171538151715561b1715">[email protected]</a>>"
  },
  {
    from:"Brother Dadson <<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="98faeaf7d8faeaf7b6fbf7f5">[email protected]</a>>"
  }
]

for (var i=0; i < emails.length; i++) {
  emails[i].from.replace(/ *\<[^)]*\> */g, "")
}

for (var i=0; i < emails.length; i++) {
  if (emails.find(email => email.from) === nickNames.find(nick => nick.emailAddress)) {
    emails[i].nickName = nick.nickName
  }
}

Attempting to achieve two goals:

  1. Check both arrays for any matches between:
nickNames.emailAddress

and

emails.from

The regular expression used to extract the email address works in a different part of my code, but not here.

  1. If there is a match, add a new key-value pair in the matching email array element, with the corresponding nickname.

Expected outcome:

emails = [
  {
    from:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="294d484d694d484d074a4644">[email protected]</a>",
    nickName: "Father"
  },
  {
    from:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="573a383a173a383a7934383a">[email protected]</a>",
    nickName: "Mother"
  },
  {
    from:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="6a0818052a08180544090507">[email protected]</a>"
  }
]

Appreciate any help you can offer!

javascriptarrays

Answer №1

Your regular expression seems to be deleting the email address from the from property instead of preserving it. I have included a different regex below that extracts the email address during comparison and disregards everything else.

const nickNames = [
  {
    nickName:"Dad",
    emailAddress:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="1a7e7b7e5a7e7b7e34797577">[email protected]</a>",
  },
  {
    nickName:"Mom",
    emailAddress:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="a9c4c6c4e9c4c6c487cac6c4">[email protected]</a>",
  },
  {
    nickName:"BFF",
    emailAddress:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="791b1f1f391b1f1f571a1614">[email protected]</a>",
  }
]

let emails = [
  {
    from:"Dad Dadson <<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="45212421052124216b262a28">[email protected]</a>>"
  },
  {
    from:"Mom Dadson <<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="fb969496bb969496d5989496">[email protected]</a>>"
  },
  {
    from:"Brother Dadson <<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="07657568476575682964686a">[email protected]</a>>"
  }
]

emails.forEach(email => {
  const match = nickNames.find(nickName => nickName.emailAddress === email.from.replace(/^(.* )<(.+)>/, "$2"));
   if (match) {
       email.nickName = match.nickName;
   }
});
console.log(emails);

Answer №2

To achieve the expected result, regular expressions are not necessary-

var users = [
  {
name:"John Doe",
email:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="123456789abcde">[email protected]</a>",
  },
  {
name:"Jane Smith",
email:"<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="56789abcde12">[email protected]</a>",
  },
]

var contacts = [
  {
from:"Doe <<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="485abcde26">[email protected]</a>>"
  },
  {
from:"Smith <<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="89abcde56">[email protected]</a>>"
  }
]

users.forEach(item=>{
    contacts.forEach((entry)=>{
        if(entry.from.includes(item.email))
        {
            entry.name = item.name;
        }
    });
});

console.log(contacts);

Answer №3

function createEmailToNickNameMapping(emails, nickNames) {

  // This function creates a mapping from email addresses to nicknames
  const addKeyValue = (map, { nickName, emailAddress }) => {
    map.set(emailAddress, nickName);
    return map;
  };

  // Utilizing Array#reduce for creating the mapping 
  const emailToNickNameMap = nickNames.reduce(addKeyValue, new Map());

  // Regular expression for extracting emails in <<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ef8d9d80af8d9d80c18c8082">[email protected]</a>> format
  const regexpEmail = new RegExp(/\<(.*)\>$/);
  
  // Using Array#map function to process each email entry
  return emails.map(({ from }) => {
    // Extracting email from the pattern <email>
    const email = from.match(regexpEmail)[1];

    // Checking if there is a nickname associated with the email
    const nickName = emailToNickNameMap.get(email);
    if (nickName) {
      return { email, nickName };
    } else {
      return { email };
    }
  });
}

const result = createEmailToNickNameMapping(emails, nickNames);
console.log(result);

This is a more functional approach that can yield better performance with larger datasets.

Consider exploring sets, maps, and objects as alternative data structures for efficient item searches in similar scenarios.

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