🏁 Final Form Mutator Example

mutators.js

/** Clears a form value */
const clear = ([name], state, { changeValue }) => {
  changeValue(state, name, () => undefined)
}

/** Converts a form value to uppercase **/
const upper = ([name], state, { changeValue }) => {
  changeValue(state, name, value => value && value.toUpperCase())
}

const form = createForm({
  onSubmit,
  mutators: { clear, upper }
})

...

form.mutators.upper('foo')

...

form.mutators.clear('foo')