How can I pass both the key and the value without resorting to bind?

binding-answer.es6

const handleFieldUpdate = (key) => (value) => setState({ [key]: value })

const SomeForm = () => (
    <Input
      placeholder='Name'
      onChange={handleFieldUpdate('name')}
    />
)

const Input = ({
    value,
    placeholder,
    onChange,
}) => (
    <TextInput // React Native
      value={value}
      placeholder={placeholder}
      onChangeText={onChange}
    />
)

binding-question.es6

function handleFieldUpdate(key, value) {
    this.setState({
        [key]: value,
    });
}

const SomeForm = () => (
    <Input
      placeholder='Name'
      onChange={handleFieldUpdate}
    />
)

const Input = ({
    value,
    placeholder,
    onChange,
}) => (
    <TextInput // React Native
      value={value}
      placeholder={placeholder}
      onChangeText={onChange}
    />
)