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交作业

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当下sunxyz

#1 Created at ... [Delete] [Delete and Lock User]
 return arr.reduce((x,y)=>x*y);
 return s.split('').map(x=>x*1).reduce((x,y)=>x*10+y);
 return arr.map(x=>x.substr(0,1).toUpperCase()+x.substr(1).toLowerCase());
r = arr.map(x => parseInt(x));

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