Programming Examples
JavaScript function to extract unique characters from a string
Write a JavaScript function to extract unique characters from a string.
Example string : "thequickbrownfoxjumpsoverthelazydog"
Expected Output : "thequickbrownfxjmpsvlazydg"
Solution<!DOCTYPE HTML>
<html>
<head>
<title>Unique Character</title>
<style type="text/css">
.error_msg
{
color:#ff0000;
font-style:italic;
}
</style>
<script language="javascript">
function unique_char()
{
var data=document.getElementById('user_txt').value;
document.getElementById('error').innerHTML="";
document.getElementById('result').innerHTML="";
var unique='';
var i,j;
if(data=="")
{
document.getElementById('error').innerHTML="Please Enter the text";
}
else
{
for(i=0; i<data.length; i++)
{
for(j=i-1; j>=0; j--)
{
if(data.charAt(j)==data.charAt(i))
{
break;
}
}
if(j<0)
{
unique+=data.charAt(i);
}
}
document.getElementById('result').innerHTML=unique;
}
}
</script>
</head>
<body>
<form name="frm" id="frm">
<div>
<label for="user_txt">Enter the Text</label>
</div>
<div>
<textarea name="user_txt" id="user_txt" rows="10" cols="30"></textarea>
<span id="error" class="error_msg"></span>
</div>
<div>
<input type="button" name="check_btn" id="check_btn" value="Get Unique Char" onclick="unique_char()"/>
</div>
<div>
<h3>Output</h3>
<span id="result"></span>
</div>
</form>
</body>
</html>Output/ Explanation: