itsyoboieltr Comments - Answer Overflow

I think it would be a great first step to support the primitive, simple use-cases, which is what most people would need this feature for. I think for the use-case I am talking about, it would be relatively simple to make something work. I would propose that we ignore regexes, length, and all the other stuff, as the generated default value is not supposed to be correct (does not need to pass type validation), as I expect the user in the frontend to update this value to make it correct at the time of submission. This is the original code, basically the reason why this feature should be implemented:

import { type } from 'arktype';

export const user = type({ name: 'string' });

export const getDefaultUser = () => ({ name: '' });

import { type } from 'arktype';

export const user = type({ name: 'string' });

export const getDefaultUser = () => ({ name: '' });

Let's say I update the user type's name property to match a regex pattern. I would still want the default user's name to have a value of an empty string, as the user will need to enter his name. The generated default name does not need to match the regex pattern.

import { type } from 'arktype';

export const user = type({ name: /^([A-Za-z]+)\s([A-Za-z]+)$/ });

export const getDefaultUser = () => ({ name: '' });

import { type } from 'arktype';

export const user = type({ name: /^([A-Za-z]+)\s([A-Za-z]+)$/ });

export const getDefaultUser = () => ({ name: '' });

Similar for length, and other properties:

import { type } from 'arktype';

export const user = type({ name: 'string > 10' });

export const getDefaultUser = () => ({ name: '' });

import { type } from 'arktype';

export const user = type({ name: 'string > 10' });

export const getDefaultUser = () => ({ name: '' });

I wouldn't expect a random 10 character string to be generated here. (By the way, in TypeBox, this would generate: 'aaaaaaaaaa') So maybe a practical solution is easier than you first thought? Of course, if your goal is to create a default value that is 100% according to the type and passes validation, then it can get complex pretty quick. But most of the time, default values are not expected to conform to the type, as they are supposed to be updated later (in the use-case of generating initial state for a form).

23 replies

Gaming

Programming