Non-recursive deep stripping on null values in two version clone/non-clone

stripNullDeepTest.js

var obj = {
    a: 1,
    b: null,
    c: [
        {
            d: null,
            e: 'something'
        }
    ]
};

console.log("Orginal:");
console.info(obj);

console.log("stripNullDeepClone:");
var obj2 = stripNullDeepClone(obj);
console.info(obj2);
console.info(obj);

console.log("stripNullDeep:");
stripNullDeep(obj);

console.info(obj);
function stripNullDeep(obj) {
    var seen = {};
    var objs = [obj];
    while(objs.length > 0) {
        obj = objs.shift();
        for(key in obj) {
            if (obj[key] === null) {
                delete obj[key];
            } else if(typeof obj[key] === 'object') { // Also matches arrays
                objs.push(obj[key]);
            }
        }
    }
}

function stripNullDeepClone(obj) {
    var result = Object.assign({}, obj);
    var objs = [result];
    while(objs.length > 0) {
        obj = objs.shift();
        for(key in obj) {
            if (obj[key] === null) {
                delete obj[key];
            } else if(typeof obj[key] === 'object') {
                obj[key] = Array.isArray(obj[key]) ? obj[key].slice(0) : Object.assign({}, obj[key]);
                objs.push(obj[key]);
            }
        }
    }
    return result;
}