What is a concise function that formats a (String) decimal into a currency format in Salesforce Apex?

Hi Manpreet

public static String currency(String i) {
String s = ( Decimal.valueOf(i==null||i.trim()==''?'0':i).setScale(2) + 0.001 ).format();
return s.substring(0,s.length()-1);
}

Hope it may help

The following should do the trick, with the assumption that your locale for currency formatting is correct. Edited to handle null being passed, and zero values after the decimal.
`
public static String currency(String input) {
if ( input == null ) {
return '0.00';
}

Decimal d1 = Decimal.valueOf(input).setScale(2);
String str = d1.format();
if( !str.contains('.' ) ) {
str = str + '.00';
}

return str;
}
`
Thanks.