Fromcharcode function returns chars using UTF-16 code units in JavaScript

FromCharCode()

Convert UTF-16 (16-bit Unicode Transformation Format) code units to string.

document.write(String.fromCharCode(70)); // output F

Total range of UTF-16 values are from 0 and 65535. The first 128 unicode value are direct match of ASCII chars. We can get a string output by using fromcharcode.

document.write(String.fromCharCode(70,71,72));// Output is FGH

Let us try to print all the chars by using a for loop and displaying Unicode value and char The ASCII table ( 0 to 127 )

<script type="text/javascript">
document.write("<table>");
for(var i=0;i<=127;i++){
if( i%5 ==0){document.write ("</tr><tr>");}
document.write("<td>" + i + ' = '+String.fromCharCode(i) + "</td>");
}
document.write("</tr></table>");
</script>

The extended ASCII table ( 128 to 255 )

<script type="text/javascript">
document.write("<table>");
for(var i=128;i<=255;i++){
if( i%5 ==0){document.write ("</tr><tr>");}
document.write("<td>" + i + ' = '+String.fromCharCode(i) + "</td>");
}
document.write("</tr></table>");
</script>

Note : Direct output of all ASCII chars may not be visible in browser ( like Nul, space etc )

charcodeat to get UTF-16 of the given index point

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