The compare validator is quite similar to the letter validator we've built in our examples.

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

  • compare: The value compared against


The compare validator supports three parameter signatures:

  1. compare(value) where the value is used as the compare named prop

  2. compare(propsObject) where the props object contains a compare named prop

  3. compare(propsFunction) where the props function returns a props object with a compare named prop


import validate, {compare} from 'strickland';

// As a value parameter
const letterA = compare('A');

// As a named prop
const letterB = compare({
    compare: 'B',
    message: 'Must be the letter "B"'

// Using a function that resolves to have the named prop
const letterValidator = compare((context) => ({
    message: `Must match "${}"`

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