Javascript Data Type How to - Count how many times a single letter appears in a word








Question

We would like to know how to count how many times a single letter appears in a word.

Answer


<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){<!--   w  ww  .j  av  a  2 s.co  m-->
var letterInWord = function (letter, word) {
   return (word.match( new RegExp(letter, 'g') ) || []).length;
};
document.writeln( letterInWord('p', 'apple') )
document.writeln('<br/>');
document.writeln( letterInWord('k', 'conduct k') )
document.writeln('<br/>');
document.writeln( letterInWord('d', 'test') )
}
</script>
</head>
<body>
</body>
</html>

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