f2e5e26af3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
669 B
669 B
deepClone
Creates a deep clone of an object.
Use recursion.
Use Object.assign() and an empty object ({}) to create a shallow clone of the original.
Use Object.keys() and Array.prototype.forEach() to determine which key-value pairs need to be deep cloned.
const deepClone = obj => {
let clone = Object.assign({}, obj);
Object.keys(clone).forEach(
key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])
);
return Array.isArray(obj) ? (clone.length = obj.length) && Array.from(clone) : clone;
};
const a = { foo: 'bar', obj: { a: 1, b: 2 } };
const b = deepClone(a); // a !== b, a.obj !== b.obj