This method returns a number indicating the Unicode value of the character at the given index.
Unicode code points range from 0 to 1,114,111. The first 128 Unicode code points are a direct match of the ASCII character encoding. charCodeAt() always returns a value that is less than 65,536.
Use the following syntax to find the character code at a particular index.
string.charCodeAt(index);
index − An integer between 0 and 1 less than the length of the string; if unspecified, defaults to 0.
Returns a number indicating the Unicode value of the character at the given index. It returns NaN if the given index is not between 0 and 1 less than the length of the string.
Try the following example.
<html> <head> <title>JavaScript String charCodeAt() Method</title> </head> <body> <script type="text/javascript"> var str = new String( "This is string" ); document.write("str.charCodeAt(0) is:" + str.charCodeAt(0)); document.write("<br />str.charCodeAt(1) is:" + str.charCodeAt(1)); document.write("<br />str.charCodeAt(2) is:" + str.charCodeAt(2)); document.write("<br />str.charCodeAt(3) is:" + str.charCodeAt(3)); document.write("<br />str.charCodeAt(4) is:" + str.charCodeAt(4)); document.write("<br />str.charCodeAt(5) is:" + str.charCodeAt(5)); </script> </body> </html>
str.charCodeAt(0) is:84 str.charCodeAt(1) is:104 str.charCodeAt(2) is:105 str.charCodeAt(3) is:115 str.charCodeAt(4) is:32