JavaScript - Replace two characters with each other?

Question

I have a string and I want to replace every capital 'I' with small 'i', and every small 'i' with a capital 'I'. As you can see if I do this in two stages it just converts it, then converts it back to how it was before. So how would I do it all at once?

<html>
<head>
<script type="text/javascript">
function init() {
    text = document.getElementById('test');
    newtext = text.innerHTML.replace(/I/g, "i");
    newtext = newtext.replace(/i/g, "I");
    text.innerHTML = newtext;
}
</script>   
</head>

<body onload="init()">
<div id="test">
THIS IS SOME TEST 
</div>
</body>
</html>

Paul · Accepted Answer · 2012-06-16 17:13:51Z

7

newtext = text.innerHTML.replace(/[iI]/g, function(l) {
  return l.toUpperCase() === l ?
    l.toLowerCase() : l.toUpperCase();
});

edited Jun 16, 2012 at 17:13

Paul

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answered Jun 16, 2012 at 17:13

James

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4 Comments

Paul Over a year ago

+1, and made a small edit so that it only works on i and I.

Andy Lobel Over a year ago

to me that sais 'if i is equal to I then return i' which dont make sense but owell it works lol

James Over a year ago

@AndyLobel, for every character that is either i or I the function will be called. It compares the letter to itself uppercase'd. So, for the letter i, toUpperCase will return I which is not === to i, meaning that the function will return the upper case version, and vice versa for the opposite.

Andy Lobel Over a year ago

@999 ah right i get it now, is there anything wrong with doing return l == "i" ? "I" : "i";

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