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fullstack ruleP1universalStack: javascript
javascriptprototypesutilitiesmaintainability
Avoid extending built-in prototypes; export a utility instead
Don't add methods to global built-ins like Date/Number; provide a standalone helper function so it's clear what is built-in vs custom.
PR: hegnar-web · org-mining-hist-2026-06Created: Jun 19, 2026
Bad example
Old codejavascript
| 1 | Date.prototype.toNorwegianFormat = function() { |
| 2 | return this.toLocaleDateString('no-NO'); |
| 3 | }; |
Explanation (EN)
Objašnjenje (HR)
Good example
New codetypescript
| 1 | export function formatDateToNorwegian(date: Date): string { |
| 2 | return date.toLocaleDateString('no-NO'); |
| 3 | } |
Explanation (EN)
Objašnjenje (HR)