數組內對象去重的三種方法

1、reduce

const obj = {}
const arr = [
	{code: 1},
	{code: 1},
	{code: 2}
]
	
let newArr = arr.reduce((pre,next)=>{
	obj[next.code] ? '' : obj[next.code] = true && pre.push(next)
	return pre
},[])

console.log(newArr)		// [{code: 1},{code: 2}]

2、forEach

const arr = [
	{code: 1},
	{code: 1},
	{code: 2}
]
let obj = {}
let newArr = []

arr.forEach(item=>{
	obj[item.code] = item
})
for(let i in obj){
	newArr.push(obj[i])
}
console.log(newArr)		// [{code: 1},{code: 2}]

3、map + JSON.stringify

const arr = [
	{code: 1},
	{code: 1},
	{code: 2}
]
let tempArr = []
arr.forEach(item=>{
	tempArr.push(JSON.stringify(item))
})
tempArr = Array.from(new Set(tempArr)).map(item=> JSON.parse(item))
console.log("tempArr:::", tempArr)