clone Array recursively

recurClone.js

function recurClone(input) {
    var output = void(0), i, len;
    
    if(input instanceof Array) {
        output = [];
        for(i=0,len=input.length; i<len; i++) {
            output.push(recurClone(input[i]));
        }
    } else {
            output = input; 
    }

    return output;
}

var arr1 = [['foo', ['bar']], 'baz', { hoge: 'huga' }];
var arr2 = recurClone(arr1);

console.log(arr1 === arr2); // false
console.log(arr1[0] === arr2[0]); // false
// replace reference of only Arrays (don't apply to primitives and other objects)
console.log(arr1[0][0] === arr2[0][0]); // true
console.log(arr1[0][1] === arr2[0][1]); // false
console.log(arr1[1] === arr2[1]); //true
console.log(arr1[3] === arr2[3]); //true