if(!typeof(s)==='string') return null; else{ var a = []; for(let i = s.length-1;i>=0;i--){ a[i] = s.charAt(i); } console.log(a); var newa = a.map(function(s){ if (s==="0") return 0; else if (s==="1") return 1; else if (s==="2") return 2; else if (s==="3") return 3; else if (s==="4") return 4; else if (s==="5") return 5; else if (s==="6") return 6; else if (s==="7") return 7; else if (s==="8") return 8; else if (s==="9") return 9; }); console.log(a); return newa.reduce(function(x,y){ return x*10+y; }); }
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