[Javascript] Different ways to create an new array/object based on existing array/object

Array:

1. slice()

const newAry = ary.slice()

2. concat

const newAry = [].concat(ary)

3. spread opreator:

const newAry = [...ary]

4. Array.from:

const newAry = Array.from(ary)

Object:

Shadow copy:

1. object.assign:

const newObj = Object.assign({}, obj, {prop: 'newProp'})

2. spread opreator:

const newObj = {
   ...obj
}

Deep copy:

From lodash:

const newObj = _.cloneDeep(obj)

From Ramda:

const newObj = R.clone(obj);

JS:

const newObj = JSON.parse(JSON.stringify(obj))
原文地址:https://www.cnblogs.com/Answer1215/p/6864981.html