//给数组中的每一项增加3

function addThreeForEachItem(array){

      for(var i = 0; i < array.length; i++){

        array[i] = array[i] + 3;

    }

    return array;

}

//将数组中的每一项编码

function encodeEachItem(array){

    for(var i = 0; i < array.length; i++){

        array[i] = encodeURIComponent(array[i]);

    }

    return array;

}

The two functions are very similar (duplicate). How to encapsulate the repeated parts of these two functions into one function?