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var f=function deepCopy(o1,o2){
    for (let index in o1){
        if(typeof o1[index]=='Object'){
            deepCopy(o1[index],o2[index])
        }
        else
            o2[index]=o1[index]
    }
    return o2
}
a1=[1,[1,2],3]
a2=[]
f(a1,a2)
b1={1:2,2:[1,2]}
b2={}
f(b1,b2)

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