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JavaScript String method: charCodeAt()

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The charCodeAt() method (when applied to a JavaScript string) returns the Unicode character code of the character at specified index position (note: strings in JavaScript are zero index based, so the first character is at position zero).

 

It has the following syntax with the following parameters:

 

string.charCodeAt(indexvalue)

 

Parameter

Required / Optional

Description

indexvalue

Required

Integer indicating index (position) of character for which to return its Unicode character code

 

EXAMPLE:


HTML USED IN THIS EXAMPLE:
<!DOCTYPE html>
<html> <!-- Copyright (c) Nematrian Limited 2018 -->
<head>
<style>
table,th,tr,td {border: 1px solid black; border-collapse: collapse;}
</style>
</head>
<body>
<table>
<tr>
<th>Example</th>
<th>Resulting value of <code>x</code></th>
</tr>
<tr>
<td><code id="Example"></code></td>
<td><code id="Result"></code></td>
</tr>
</table>

<script>
var y = "abcde", pos=3;
document.getElementById("Example").innerHTML =
  'var y = "' + y + '";<br>' +
  'var x = y.charCodeAt(' + pos + ');';
document.getElementById("Result").innerHTML
  = y.charCodeAt(pos);
</script>

</body>
</html>

FUNCTION THAT MAY ASSIST IN TESTING WHETHER FEATURE IS SUPPORTED:
function isSupportedJavaScriptMethodStringCharCodeAt() {
  var z = "abc"; return !!z.charCodeAt;
}


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