where to eat

select.js

const menu = [
	{
		name: 'YOSHINOYA 22',
		weight: 4
	},
	{
		name: 'YOSHINOYA 24',
		weight: 4
	},
	{
		name: 'MCDONALDS 30',
		weight: 3
	},
	{
		name: 'MCDONALDS 40',
		weight: 3
	}
]

function randomChoice(menu){
	let array = []
	menu.forEach((item) => {
		array = array.concat(Array.apply(null, {length: item.weight}).map(() => item.name))
	})
	return array[Math.floor(Math.random() * array.length)]
}

console.log(randomChoice(menu))