asm1

function asm1(param) {
  let eax = 0;

  if (param > 0xde) {
    return part_a();
  } else if (param !== 0x8) {
    return part_b();
  } else {
    eax = param + 0x3;
    return part_d();
  }

  function part_a() {
    if (param !== 0x4e) {
      return part_c();
    } else {
      eax = param - 0x3;
      return part_d();
    }
  }

  function part_b() {
    eax = param - 0x3;
    return part_d();
  }

  function part_c() {
    eax = param + 3;
    return part_d();
  }

  function part_d() {
    return eax;
  }
}


Alternatively, line by line:
0xcd:

is 0xcd > 0xde? FALSE
is 0xcd != 0x8? TRUE
jne part_b

return 0xcd - 0x3 = 0xca