How to convert one-dimensional array to three-dimensional array in javascript? Method introduction

How to convert one-dimensional array to three-dimensional array in javascript? This article will share with you a conversion method. This method is enough to convert a JS one-dimensional array into a three-dimensional array!

#Today I saw a friend who asked a question. He wanted to convert a one-dimensional array into a three-dimensional array. He happened to be not very busy and was willing to help. I immediately arranged for this classmate

The following is the one-dimensional array data format returned to us by the back-end classmates

[{ '品牌': 'xiaomi', '机型': '10', '配置': '512' }, { '品牌': 'xiaomi', '机型': '10', '配置': '128' }, { '品牌': 'xiaomi', '机型': '11', '配置': '128' }, { '品牌': 'xiaomi', '机型': '11', '配置': '64' }, { '品牌': 'iPhone', '机型': '10', '配置': '128' }, { '品牌': 'iPhone', '机型': '11', '配置': '64' }, { '品牌': 'iPhone', '机型': '12', '配置': '64' }, { '品牌': 'honor', '机型': '4', '配置': '256' }, { '品牌': 'honor', '机型': '5', '配置': '128' }, { '品牌': 'honor', '机型': '6', '配置': '128' }];

The following is the data format we want to convert (converted into The first level of the three-dimensional array is the brand, the second level is the model, and the third level is the configuration)

[ { "value": "xiaomi", "label": "xiaomi", "children": [ { "value": "10", "label": "10", "children": [ { "value": "512", "label": "512" }, { "value": "128", "label": "128" } ] }, { "value": "11", "label": "11", "children": [ { "value": "128", "label": "128" }, { "value": "64", "label": "64" } ] } ] }, { "value": "iPhone", "label": "iPhone", "children": [ { "value": "10", "label": "10", "children": [ { "value": "128", "label": "128" } ] }, { "value": "11", "label": "11", "children": [ { "value": "64", "label": "64" } ] }, { "value": "12", "label": "12", "children": [ { "value": "64", "label": "64" } ] } ] }, { "value": "honor", "label": "honor", "children": [ { "value": "4", "label": "4", "children": [ { "value": "256", "label": "256" } ] }, { "value": "5", "label": "5", "children": [ { "value": "128", "label": "128" } ] }, { "value": "6", "label": "6", "children": [ { "value": "128", "label": "128" } ] } ] } ]

First we define an arr variable to receive our one-dimensional array, and then pass arr as a parameter to us to convert the array function, the function returns our final three-dimensional array

The following is our arrConversion source code

arrConversion (arr) { let keys = Object.keys(arr[0]) let level1 = keys[0]//获取一级属性名称 let level2 = keys[1]//获取二级属性名称 let level3 = keys[2]//获取三级属性名称 let list = Array.from(new Set( arr.map(item => { return item[level1] }))) let subList = [] list.forEach(res => { arr.forEach(ele => { if (ele[level1] === res) { let nameArr = subList.map(item => item.value) if (nameArr.indexOf(res) !== -1) { let nameArr2 = subList[nameArr.indexOf(res)].children.map(item => item.value) if (nameArr2.indexOf(ele[level2]) !== -1) { subList[nameArr.indexOf(res)].children[nameArr2.indexOf(ele[level2])].children.push({ value: ele[level3], label: ele[level3], }) } else { subList[nameArr.indexOf(res)].children.push({ value: ele[level2], label: ele[level2], children: [{ value: ele[level3], label: ele[level3], }] }) } } else { subList.push({ value: res, label: res, children: [{ value: ele[level2], label: ele[level2], children: [{ value: ele[level3], label: ele[level3], }] }] }) } } }) }) return subList }

The output result is correct

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