return Array.prototype.map.call(s,function(c){return c*1;}).reduce(function(x,y){return x*10+y});
return arr.map(function(s){ s=s.toLowerCase(s); return s.substring(0,1).toUpperCase()+s.substring(1) });
照你的代码,第二题只用一行:
return s*1;
完事~
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