What are the methods of removing duplicates in six arrays of js?
This article mainly introduces the relevant knowledge of what js six array deduplication methods are, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value. I believe you will gain something after reading this js six array deduplication methods. Let's take a look at it.
The first new Set
Var fun = function (arr) {
Return [... New Set (arr)]
}
The second kind of new Map
Var fun = function (arr) {
Let map = new Map ()
Let res = []
For (let I = 0; I
< arr.length; i++） { if （！map.has（arr[i]）） { map.set（arr[i], i）; res.push（arr[i]）; } } return arr; }; 第三种 两层for循环+splice var fun = function （arr） { let len = arr.length; let res = []; for （let i = 0; i < len; i++） { for （let j = i + 1; j < len; j++） { if （arr[i] === arr[j]） { arr.splice（j, 1）; len--; j--; i--; } } } return arr; }; 第四种 indexOf var fun = function （arr） { let res = []; for （let i = 0; i < arr.length; i++） { if（res.indexOf（arr[i]）==-1） { res.push（arr[i]） } } return res }; 第五种 includes var fun = function （arr） { let res = []; for （let i = 0; i < arr.length; i++） { if （！res.includes（arr[i]）） { res.push（arr[i]） } } return res }; 第六种 filter var fun = function （arr） { return arr.filter（（item, index） =>{
Return arr.indexOf (item) = = index
})
}
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