aretherecookies-mobile/js/helpers/QuantityHelpers.js

// @flow
import { type Quantity } from '../constants/QuantityConstants';

const quantityLabels: { [Quantity]: string } = {
	none: 'None left',
	few: 'A few left',
	lots: 'A lot left',
	many: 'Plenty left',
};

export const getQuantityLabelText = (quantity: Quantity) =>
	quantityLabels[quantity] || quantityLabels['many'];

export const getQuantityDropdownText = (quantity: Quantity) => {
	const label = quantityLabels[quantity];
	switch (quantity) {
		case 'none':
			return `${label} - 0`;
		case 'few':
			return `${label} - 6 or fewer`;
		case 'lots':
			return `${label} - 10 or fewer`;
		default:
			return `${label} - more than 10`;
	}
};

const quantityAsNumber = (q: Quantity): number => {
	switch (q) {
		case 'none':
			return 3;
		case 'few':
			return 2;
		case 'lots':
			return 1;
		case 'many':
			return 0;
		default:
			return 3;
	}
};

export const compareQuantity = (left: Quantity, right: Quantity): number => {
	return quantityAsNumber(left) - quantityAsNumber(right);
};