5 ms·

PHP has optional types as well, although types are enforced when present

• colejohnson66 5y ago
  That's a major limitation of JavaScript. For example: // TypeScript function add(a: number, b: number): number { return a + b; } // tsc output (JavaScript) function add(a, b) { return a + b; } // (ab)use by someone using my lib without TypeScript add("abc", "def"); Now, addition is a contrived example because it'll still work with strings, but the point is that such usage violates my code contract because the contract was deleted during compilation. It's possible to do this: function add(a: number, b: number): number { if (typeof a !== 'number' || typeof b !== 'number') throw 'no'; return a + b; } But that's needlessly verbose, and eslint will complain about useless code. If enforceable type annotations could be added to JavaScript, that'd be a huge plus.
  • ketzo 5y ago
    As I understand this proposal, it would not add what you're talking about. Just for clarity.
• deleted 5y ago
  [deleted]