Fast String to Int Converter

FastStringToInt.cs

// Our example symbol
var symbol = "ABC-1234";

// Get the last 4 digits of our symbol
var str = symbol.AsSpan(4, 4);

var base10 = 0;

for (i = 0; i < 4; i++)
{
  // Iterate through each digit, multiply the result by 10 for 
  // each digit we add based on its ASCII value 
  base10 = base10 * 10 + (str[i] - 48);
}