javascript - Convert Arrow function to function expression

Question

I have a function with a map object:

function xml_encode(s)
{
 return Array.from(s).map(c =>
 {
  var cp = c.codePointAt(0);
  return ((cp > 127) ? '&#' + cp + ';' : c);
 }).join('');
}

This has worked great except it has broken everything when running Internet Explorer 11.

I tried to rewrite the code using a function expression however I get a c is not defined:

function xml_encode(s)
{
 return Array.from(s).map(function()
 {
  var cp = c.codePointAt(0);
  return ((cp > 127) ? '&#' + cp + ';' : c);
 }).join('');
}

Unfortunately this needs to be a public-facing function and I am required to support IE11 for now. How do I rewrite this function to work with IE11?

Answer 1

You're missing the argument of your function so try this

function xml_encode(s) {
  return Array.from(s).map(function(c) {
    var cp = c.codePointAt(0);
    return ((cp > 127) ? '&#' + cp + ';' : c);
  }).join('');
}