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Workflows
Coding workflows · Integer money calculations
03
A concrete starting point
Change a basket total to add integer minor units instead of floating-point amounts. Test zero items, a refund and the largest supported sum, rejecting mixed currencies before any addition.
Define the change
Describe the input, expected output and boundaries that must stay intact.
Inspect the work
Review the proposed edits and any commands before relying on their result.
Check the outcome
Compare actual behavior with the expected result. If a check fails, investigate it before applying more changes.
Integer money calculations
A concrete starting point
if (a.currency !== b.currency) throw new Error("currency");
if (![a.minor, b.minor].every(Number.isSafeInteger)) throw new Error("amount");
const minor = a.minor + b.minor;
if (!Number.isSafeInteger(minor)) throw new Error("range");
return { currency: a.currency, minor };The example is a starting point for a real project, not a claim that generated code is already tested. Adjust paths, dependencies and expected behavior to match your application.