cd into this project and run the binary:
$ ./bin/calculatorTo exit, type q or CTRL+D.
Calculator is composed of:
Calculator::CLICalculator::Processor
Calculator::CLI owns the REPL.
When exceptions are raised in Calculator::Processor, they are rescued here and written to stdout.
Calculator::Processor owns the core calculator functionality. Numbers are pushed on to an internal stack and evaluated when an arithmetic operator (+, -, *, /) is encountered.
Input values are validated here to be arithmetic operators or numbers.
Exceptions raised here bubble up to the CLI.
- Specs have many opportunities for DRYing up.
- Specs spawn this in a separate process so that input and output can be tested directly. However, this means that async issues can mean these tests are potentially brittle. Perhaps, we should look at non-async testing strategies.
- Fix divide by zero errors in some scenarios where they are not handled. This means there might also be an opportunity for normalizing some logic.