Dead simple arithmetic evaluator created for educational purposes. It doesn't use eval() but contains custom tokenizer and evaluator. It correctly handles precedence of operators and parenthesis.
I didn't provide npm package because it was created solely for educational purposes and has no practical use. But if you want to play with it just run:
# clone repository first
git clone [email protected]:bogdan0083/arithmetic-eval.git
cd ./arithmetic-eval
# to evaluate expression
npx tsx ./bin/cli.ts -e "2 + 2"
# Or you can use `npm link` to create symlink and use the package globaly
npm link
arithmetic-eval -e "2 + 2"
# Here's help output:
arithmetic-eval --help
Usage: arithmetic-eval [options]
Options:
-e, --expression <exp> expression to evaluate
-s, --print-steps print each step while evaluating (default: false)
-r, --repl run interactive repl (default: false)
-h, --help display help for command
It first tries to parse symbols as a list of tokens. Then tokens are converted to Postfix notation and finally evaluated.