Validator Factories

Validators often need to be configurable. Instead of always validating that a value matches the letter 'A', our letter validator might need to accept which letter to compare against. To accomplish that, we can define a Validator Factory that accepts props, including the desired letter, and returns a validator to be used.
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import validate from 'strickland';
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​
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function letterValidator({letter}) {
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    return (value) => value === letter;
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}
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​
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const validator = letterValidator({letter: 'B'});
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const result = validate(validator, 'B');
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​
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/*
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    result = {
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        isValid: true,
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        value: 'B'
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    }
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 */
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Validator factories merely take advantage of JavaScript's functional nature--in fact, Strickland has no awareness of them. Strickland only requires that validators are functions that accept a value and return a validation result. You can produce those functions however you'd like, but the validator factory approach is a convenient way to extend the functionality of your validators.

Extensibility

Validation Context

Last modified 1yr ago

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