remove duplicate strings that are case insensitive

**MadMich** · 01-03-2013 03:34 AM

How can i make this script case insensitve (e.g. at the moment i get 'damon' and 'Damon'. Say i just want to keep the lowercase 'damon'?)?

var unique = function(origArr) {
var newArr = [],
origLen = origArr.length,
found,
x, y;

for ( x = 0; x < origLen; x++ ) {
found = undefined;
for ( y = 0; y < newArr.length; y++ ) {
if ( origArr[x] === newArr[y] ) {
found = true;
break;
}
}
if ( !found) newArr.push( origArr[x] );
}
return newArr;
}

var myarray = ['jeffrey', 'allie', 'patty', 'damon', 'Damon', 'zach', 'jeffrey', 'allie', 'patty', 'damon', 'zach', 'joe'];
myarray = unique(myarray);
myarray.join(', ');

**JMRKER** · 01-03-2013 09:15 AM

One possibility, of many ...

Code:

<!DOCTYPE HTML>
<html>
<head>
<title> Untitled </title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript">
// Modified from: http://stackoverflow.com/questions/9229645/remove-duplicates-from-javascript-array

function unique(arr) {
  var b = {};
  for (var i=0; i<arr.length; i++) { b[arr[i].toUpperCase()]=arr[i].toLowerCase(); }
  var c = [];
  for (var key in b) { c.push(b[key]); }
  return c;
}
window.onload = function() {
  alert(a+'\n\n'+unique(a));
}
var a = ['jeffrey','allie','patty','damon','Damon','zach','Jeffrey','allie','patty','damon','zach','joe'];
</script>

</head>
<body>

</body>
</html>

**007Julien** · 01-03-2013 11:45 AM

A one line variant :

Code:

var a = ['jeffrey','allie','patty','damon','Damon','zach','Jeffrey','allie','patty','damon','zach','joe'];

alert(a.join(',').toLowerCase().split(',').sort().join(',').replace(/(([^,]+),)(?=\2)/g,'').split(','));

**JMRKER** · 01-03-2013 03:53 PM

Pretty neat!

**MadMich** · 01-04-2013 02:12 AM

Thank you both these are great and a big help.
With yours Julien I get the result: 'allie, damon, jeffrey, joe, patty, zach,jeffrey' (for some reason i get an extra 'jeffery')?

As an alternative how would i modify the script to have leading caps (Allie, Damon, Jeffrey, Joe, Patty, Zach)?

Thanks again

**007Julien** · 01-04-2013 06:40 AM

I do not understand your extra jeffrey. A remove spaces of the string with a replace (/\s/g,'') could be useful ?
Since it's easy to capitalize the first letters of sentences with a new method or directly

Code:


// A new method 
String.prototype.ucFirst=function(){return this.replace(/\b(\w)/g,function(){return arguments[1].toUpperCase()})}
alert("james o'connor".ucFirst());

var a = ['jeffrey','allie','patty','damon','Damon','zach','Jeffrey','allie','patty','damon','zach','joe'];
var b=a.join(',').toLowerCase().split(',').sort().join(',').replace(/(([^,]+),)(?=\2)/g,'').replace(/\b(\w)/g,function(){return arguments[1].toUpperCase();}).split(',');
alert(b);

EDIT : Your string ('allie, damon, jeffrey, joe, patty, zach,jeffrey') is made with spaces before damon, jeffrey... zach, and not before the first allie and the last jeffrey ! Then use «simply» a

Code:

var b=a.join(',').toLowerCase().replace(/\s/g,'').split(',').sort().join(',').replace(/(([^,]+),)(?=\2)/g,'').replace(/\b(\w)/g,function(){return arguments[1].toUpperCase();}).split(',');

**MadMich** · 01-07-2013 06:24 AM

Spot on this has worked perfectly, thanks for your time.

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