貌似没抓住重点 -
console.log(`欢迎${arr.reduce((acc, curr, index) => index === arr.length -1 ? acc+'和'+curr : acc+', '+curr)}同学`);
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差不多的肥饼干
貌似没抓住重点 -
console.log(`欢迎${arr.reduce((acc, curr, index) => index === arr.length -1 ? acc+'和'+curr : acc+', '+curr)}同学`);