javascript - Trying to remove duplicates from list not working -
i want print usernames of email addresses supplied in <textarea>, without duplicates.
<textarea id="emailtextarea" rows ="10" cols="25" > sara@yahoo.com adam@yahoo.com todd@yahoo.com henry@yahoo.com wright@yahoo.com sara@yahoo.com adam@yahoo.com todd@yahoo.com </textarea> <body onload="emailsort()"> <script> //email sort function function emailsort(){ //get data textarea var emaillist = document.getelementbyid("emailtextarea").value; //put array var emaillistarray = emaillist.split("\n"); //remove extension , duplicates var usernamesarray = emaillistarray.map(function(val, index, arr) { var username = val.slice(0, val.indexof('yahoo.com')); if(!val[username]) val[username] = true; return emailusers; }); //sort list var sortedusernames = usernamesarray.sort(); //print out list document.write(sortedusernames.join('</br>')); }
in case can use lo-dash, try this:
var emails = _.compact(document.getelementbyid('emailtextarea').value.split("\n")); console.log('sorted unique emails', _.uniq(emails).sort()); example: http://jsfiddle.net/j6cnzpdv/
without lodash:
var sorteduniqueemails = document.getelementbyid('emailtextarea').value // build array of emails .split("\n") // sort .sort() // remove invalid/falsy entries (ie. blank lines) .filter(function(line) { return line.indexof('@') > -1; // assuming enough validate email }) // remove duplicates .reduce(function(result, email) { if (result.indexof(email) < 0) result.push(email); return result; }, []); console.log('sorted unique emails', sorteduniqueemails); example: http://jsfiddle.net/xa2ltxth/
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