Converts an input parameter from Decimal to Hexadecimal

dec2hex.ts

/**
 * If you want to use it, you first need to install
 * Deno at https://deno.land and run:
 * deno https://gist.github.com/uqmessias/66f3de0da2f60419b39f26ca243f3e2a/raw 222
 */
function throwError(wrongArgument = null) {
  const argumentError =
    wrongArgument === null
      ? ""
      : `"${wrongArgument}" is not a valid argument!\n\n`;
  throw new Error(
    `${argumentError}You must provide at least one decimal number as an argument.

# If you wish to convert only one decimal number, you can provide it as the only argument.
deno https://gist.github.com/uqmessias/66f3de0da2f60419b39f26ca243f3e2a/raw 222

# And you still can provide serveral decimal numbers as arguments in order to convert them.
deno https://gist.github.com/uqmessias/66f3de0da2f60419b39f26ca243f3e2a/raw 234 199 02`
  );
}

if (!Deno.args.length) {
  throwError();
} else {
  Deno.args.forEach(function(arg) {
    const dec = parseInt(arg, 10);

    if (isNaN(dec)) {
      throwError(arg);
      return;
    }

    console.log(`"${dec}" converted to "${dec.toString(16).toUpperCase()}"`);
  });
}