在Javascript中将二维数组转换为字符串

Question

const adFormats = {  leaderboard: {    sizes: [      [728, 90],    ],  },  rectangle: {    sizes: [[320, 250], [300, 250], 'fluid'],  },  halfpage: {    sizes: [[300, 600], [320, 250], [300, 250]],  },};这就是出错的地方Object.keys(adFormats).forEach(key => {  adFormats[key].sizes.forEach(size => {    if (typeof size !== 'string') {      companionSizes += `${size[0]}x${size[1]}`;     }    companionSizes += '|';  });  companionSizes += ',';});// expected output: '728x90,320x250|300x250,300x600|320x250|300x250'我想用 join() 和/或 map() 使这个更干净。为了防止使用前导或尾随分隔符。还有一些更干净的代码。

Answer 1

您可以过滤内部数组并连接所有嵌套并映射外部数组。

const

    adFormats = { leaderboard: { sizes: [ [728, 90]] }, rectangle: { sizes: [[320, 250], [300, 250], 'fluid'] }, halfpage: { sizes: [[300, 600], [320, 250], [300, 250]] } },

    result = ['leaderboard', 'rectangle', 'halfpage']

        .map(k => adFormats[k].sizes

            .filter(Array.isArray)

            .map(a => a.join('x'))

            .join('|')

        )

        .join(',')

console.log(result); // '728x90,320x250|300x250,300x600|320x250|300x250'