how to eval code from args (std::env)

[kind jolt]

if you just want a simple math expression evaluator, there are crates out there that let you pass in a string and return the evaluated result

but there's not really a way to evaluate rust code at runtime, unless you're willing to ship the whole compiler with your binary or rely on the user having rust installed on their system

[tawdry dragon]

if this is to just learn parsing and whatnot, then there are articles that explain this

https://dev.to/yjdoc2/making-a-simple-calculator-in-rust-d65 is an example