js array filter clone

gistfile1.js

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var test =[{a:1},{a:2},{a:3}];

exist = test.filter( function(itme){
    return itme.a == 3
})
console.log(exist) //outputs a:3                                                                                                                             

exist.a = 99;
console.log(test); //outputs a:1, a:2, a:3                                                                                                                   


test.forEach( function(item){
    item.a = 99;
})

console.log(test); //outputs a:99, a:99, a:99