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將 JSON 對象鍵轉換為小寫

JavaScript

ibeautiful 2023-08-10 15:48:51

所以我有以下 JSON 對象：var myObj = { Name: "Paul", Address: "27 Light Avenue"}我想將其鍵轉換為小寫，這樣我會得到：var newObj = { name: "Paul", address: "27 Light Avenue"}我嘗試了以下方法：var newObj = mapLower(myObj, function(field) { return field.toLowerCase();})function mapLower(obj, mapFunc) { return Object.keys(obj).reduce(function(result,key) { result[key] = mapFunc(obj[key]) return result; }, {})}但我收到一條錯誤消息“Uncaught TypeError: field.toLowerCase is not a function”。

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4 回答

幕布斯6054654

TA貢獻1876條經驗獲得超7個贊

我真的不確定你想用你的函數做什么，mapLower但你似乎只傳遞一個參數，即對象值。

嘗試這樣的事情（不是遞歸）

var myObj = {

Name: "Paul",

Address: "27 Light Avenue"

}

const t1 = performance.now()

const newObj = Object.fromEntries(Object.entries(myObj).map(([ key, val ]) =>

[ key.toLowerCase(), val ]))

const t2 = performance.now()

console.info(newObj)

console.log(`Operation took ${t2 - t1}ms`)

這將獲取所有對象條目（鍵/值對的數組），并將它們映射到鍵小寫的新數組，然后從這些映射條目創建新對象。

如果您需要它來處理嵌套對象，您將需要使用遞歸版本

var myObj = {

Name: "Paul",

Address: {

Street: "27 Light Avenue"

}

// Helper function for detection objects

const isObject = obj =>

Object.prototype.toString.call(obj) === "[object Object]"

// The entry point for recursion, iterates and maps object properties

const lowerCaseObjectKeys = obj =>

Object.fromEntries(Object.entries(obj).map(objectKeyMapper))

// Converts keys to lowercase, detects object values

// and sends them off for further conversion

const objectKeyMapper = ([ key, val ]) =>

([

key.toLowerCase(),

isObject(val)

? lowerCaseObjectKeys(val)

: val

])

const t1 = performance.now()

const newObj = lowerCaseObjectKeys(myObj)

const t2 = performance.now()

console.info(newObj)

console.log(`Operation took ${t2 - t1}ms`)

反對回復 2023-08-10

慕田峪7331174

TA貢獻1828條經驗獲得超13個贊

這將解決您的問題：

var myObj = {

Name: "Paul",

Address: "27 Light Avenue"

}

let result = Object.keys(myObj).reduce((prev, current) =>

({ ...prev, [current.toLowerCase()]: myObj[current]}), {})

console.log(result)

反對回復 2023-08-10

搖曳的薔薇

TA貢獻1793條經驗獲得超6個贊

var myObj = {

Name: "Paul",

Address: "27 Light Avenue"

}

Object.keys(myObj).map(key => {

if(key.toLowerCase() != key){

myObj[key.toLowerCase()] = myObj[key];

delete myObj[key];

}

});

console.log(myObj);

反對回復 2023-08-10

HUX布斯

TA貢獻1876條經驗獲得超6個贊

使用json-case-convertor

const jcc = require('json-case-convertor')

var myObj = {

Name: "Paul",

Address: "27 Light Avenue"

}

const lowerCase = jcc.lowerCaseKeys(myObj)

包鏈接： https: //www.npmjs.com/package/json-case-convertor

反對回復 2023-08-10

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將 JSON 對象鍵轉換為小寫

將 JSON 對象鍵轉換為小寫

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