Converts a number into dollars the "hard" way, because toLocaleString is unsupported by react-native on Android

formatDollarAmount.js

const formatDollarAmount = (num) => (
	'$' + `${Math.floor(num)}`
		.split('')
		.reverse()
		.reduce((result, char, index) => {
			index > 0 && !(index % 3) && result.push(',');
			return [...result, char]
		}, [])
		.reverse()
		.join('') + `${(num % 1).toFixed(2)}`.substr(1)
);