How to realize Array de-duplication by vue.js

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Vue.js method for array deduplication: use two for loops to determine the id of each item, such as [that.positions.map (train= > {that.new_Positions.push (train.trainId)}) that.resul...].

This article operating environment: windows10 system, vue 2.5.2, thinkpad T480 computer.

Array deduplication in vue.js can be considered by using for loop and. New set two ways to achieve, let's take a look at it!

The first method:

Use 2 for loops to judge the id of each item

The specific code is as follows:

/ / that.positions.map (train= > {/ / that.new_Positions.push (train.trainId) / /}) / / that.resultArr = []; / / deduplicated array / / var flag / / for (var i in that.new_Positions) {/ / flag = true / / for (var j in that.resultArr) {/ / if (that.resultArr [j] = = that.new_ Positions [I]) {/ / flag = false; / / break / /} / / if (flag) {/ / that.resultArr.push (that.new_ Positions [I]) / /} / / console.log ("that.resultArr:", that.resultArr)

The second method:

With. New set implementation

The specific code is as follows:

That.positions.map (train= > {that.new_Positions.push (train.trainId)}) that.new_Positions = [... new Set (that.new_Positions)] Console.log ("that.resultArr:", that.new_Positions) above is all the content of the article "how to remove duplicates in arrays by vue.js". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!