Published 2020-04-19
数组去重
3 种数组去重方法
Set
const arr=[1,2,🤩,🤩,🤩,2,1]
console.log([...new Set(arr)])
filter
const arr=[1,2,🤩,🤩,🤩,2,1]
arr.filter((item,index)=>arr.indexOf(item)===index)
reduce
const arr=[1,2,🤩,🤩,🤩,2,1]
arr.reduce((unique,item)=>unique.includes(item)?unique:[...unique,item],[])
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