A sample to show how to use the field changes calculator.

HowToUseFieldCalculator.js

const calculator = require('field-change-effects-calculator');
const changesCalculator = calculator(rules);

const calculateChanges = (event) => {
  const state = getState()
  const { name, value } = event.target
  const changes = changesCalculator(state)(name, ['path', 'of', 'field', 'in', 'the', 'state', 'object'], value)
  return changes
}

// HTML
<input type="text" name="country" onBlur="calculateChanges()" />