Object Deep Clone, It might hurt! Beware

deepCloneObject.js

// Create a big object in this and test the methods and see the results.
// I could not find a good way to deep clone an object.
const o = {

};

// declarative version with Object assign
// Never use this on big objects!
const deepCloneV1 = o => Object.assign({}, o, Object
	.keys(o)
	.filter(k => o[k] && typeof o[k] === 'object')
	.reduce((acc, k) => {

		if (Array.isArray(o[k])) {
			acc[k] = [...o[k]];
			return acc;
		}

		acc[k] = deepCloneV1(o[k]);
		return acc;

	}, {}));

// imperative plain version
// Never use this on big objects!
function deepCloneV2 (o) {
	const newO = {};
	const keys = Object.keys(o);
	for (let k, i = 0; i < keys.length; i++) {
		k = keys[i];
		if(Array.isArray(o[k])) {
			newO[k] = [...o[k]]
		} else if (o[k] && typeof o[k] === 'object') {
			newO[k] = deepCloneV2(o[k]);
		} else {
			newO[k] = o[k];
		}
	}
	return newO;
}

// Plain old stringify method
// Never use this on big objects!
// but best option
const deepCloneV3 = o => JSON.parse(JSON.stringify(o));