See my code
<html>
<body>
<script type="text/javascript">
var str="Visit Microsoft!";
document.write( str = str.replace("",'ss'));
</script>
</body>
</html>
The output is
ssVisit Microsoft!
Why is it happening.?
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This is correct because every string begins with an empty string. See below post for more info:
Why does "abcd".StartsWith("") return true?