Built-In Validator: max

The max validator checks that a numeric value is at most the maximum value provided.

If the value being validated is null, false, an empty string, or another falsy value other than 0, then the result will be valid. This respects the rule of thumb described in the notes for the required validator.

Named Props

  • max: The maximum value compared against

Parameters

The max validator supports three parameter signatures:

  1. max(value) where the value is used as the max named prop
  2. max(propsObject) where the props object contains a max named prop
  3. max(propsFunction) where the props function returns a props object with a max named prop

Usage

import validate, {max} from 'strickland';

// As a value parameter
const maxOf3 = max(3);

// As a named prop
const maxOf2 = max({
    max: 2,
    message: 'Must be at most 2'
});

// As a function that resolves to have the named prop
const maxValidator = max((context) => ({
    max: context.max,
    message: `Must be at most ${context.max}`
}));

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