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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2
Jinu Joseph Daniel
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7`replace` with a string will only replace the first occurrence of that string. You pass an empty string, which is found at the beginning of the string (`"something".indexOf("")` returns `0`). – Felix Kling Feb 23 '12 at 19:23
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why there is empty string at the beginning of string? – Jinu Joseph Daniel Feb 23 '12 at 19:25
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3Because `"Visit Microsoft!" === "" + "Visit Microsoft!"` – Alex K. Feb 23 '12 at 19:26
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Between the beginning of the string and the first character, there is *nothing*. Same goes for anything between characters. The empty string can be found between any characters (you can do the same what Alex did, e.g. `"foo" + "" + "bar" === "foobar"`). – Felix Kling Feb 23 '12 at 19:26
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and at the end character just try indexof("") and lastIndexof("") but what are you trying to achieve ? – VirtualTroll Feb 23 '12 at 19:28
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2To further illustrate, here's what happens, if you replace _all_ empty/zero-length strings in `str`: `str.replace(new RegExp("", "g"), "-")` → `"-V-i-s-i-t- -M-i-c-r-o-s-o-f-t-!-"` – Flambino Feb 23 '12 at 19:29
