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Editor to share with you how JavaScript uses the Map data structure to remove weight, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Using Map data structure to remove weight

Function arrayNonRepeatfy (arr) {let map = new Map (); let array = new Array (); / / the array is used to return the result for (let I = 0; I < arr.length; ivalues +) {if (map. Has (arr [I])) {/ / if the key value map .set (arr [I], true);} else {map .set (arr [I], false); / / if there is no such key value array .push (arr [I]) }} return array;} var arr = [1pc1, null,null, NaN, NaN,'NaN', 0,0, 'averse,' averse, {}, {}]; console.log (unique (arr)) / / [1, "a", "true", true,15, false, 1, {… }, null, NaN, NaN, "NaN", 0, "a", {... }, undefined]

Create an empty Map data structure, iterate through the array that needs to be deduplicated, and store each element of the array in Map as key. Since the same key value does not appear in Map, the final result is the de-duplicated result.

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