Hex to Integer conversion for Electric Imp

hex2int

// Function to convert a hexidecimal string to an integer
function hex2int(x)
{
    // Sanitize the string to all upper
    local hex = x.tostring().toupper();
    
    // Create a lookup table for the hex digits, the index represents the decimal value
    local hexChars = "0123456789ABCDEF";
    
    // Initialize a variable for the return value
    local result = 0;
    
    // Get the length of the hex string
    local length =  hex.len();
    
    // Iterate through each character of the hex string 
    for (local i = 0 ; i < length; i++)
    {
      // use the find function to convert the current hex digit to an integer
      // then use the location in the string to determine the power of 16
      // multiply and accumulate to the return value
      result += hexChars.find(hex[length-i-1].tochar())*math.pow(16,i);
    }
    
    // When loop is complete send back the result
    return result
}