MetaForge V0.7.0

Update 2023-11-08

Calculated fields

Calculated fields supposed to do preprocessing of your schema;

Warning: experimental. We do not support some types yet: Map, Set

Example

const schema = {
  $id: 'user',
  name: 'string',
  phrase: (sample, schema, root) => 'Hello ' + schema.name + ' !',
};
const sample = { name: 'Alexander' };
new Schema(schema).calc(sample); // { ..., name: 'Alexander', phrase: 'Hello Alexander !'};
schema; // { $id: 'user', name: 'Alexander', phrase: 'Hello Alexander !'};

Writing calculated fields

Calculated fields is a function that receives two arguments:

• root: root object { input: Sample }
• parent: assigned target object

Warning: your return value will be assigned to samples

Additional

Method schema.calc receives mode as second parameter; This method allow to specify
return value as:

• Schema.calc(sample, true); // Returns copy of sample with assigned values
• Schema.calc(sample); // Returns sample object with assigned values