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從 JSON 文件獲取特定鍵/值對的數組

JavaScript

慕的地6264312 2023-09-21 16:56:57

初學者 - 我想從 JSON 文件為我的世界城市類型提前項目創建一個數組。我已經獲取了數據，現在我想提取 2 個鍵/值對（稱為名稱/國家/地區）并將它們推送到一個新的字符串數組中，該數組的語法如下：const arr = ["name, country", "name, country", "name, country"...]以下是數據示例：[]:0: {country: "Andorra", geonameid: 3040051, name: "les Escaldes", subcountry: "Escaldes-Engordany"}1: {country: "Andorra", geonameid: 3041563, name: "Andorra la Vella", subcountry: "Andorra la Vella"}2: {country: "United Arab Emirates", geonameid: 290594, name: "Umm al Qaywayn", subcountry: "Umm al Qaywayn"}3: {country: "United Arab Emirates", geonameid: 291074, name: "Ras al-Khaimah", subcountry: "Ra?s al Khaymah"}...我知道我必須使用.push()and.forEach()或 for 循環，但我不知道如何去做。誰能告訴我怎么做？

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4 回答

繁花如伊

TA貢獻2012條經驗獲得超12個贊

map像這樣使用：

const?arr?=?data.map(city?=>?city.name?+?",?"?+?city.country);

arrdata將是一個與 in中的每個city對象data映射到 string 的長度相同的新數組city.name + ", " + city.country。

演示：

const data = [ {country: "Andorra", geonameid: 3040051, name: "les Escaldes", subcountry: "Escaldes-Engordany"}, {country: "Andorra", geonameid: 3041563, name: "Andorra la Vella", subcountry: "Andorra la Vella"}, {country: "United Arab Emirates", geonameid: 290594, name: "Umm al Qaywayn", subcountry: "Umm al Qaywayn"}, {country: "United Arab Emirates", geonameid: 291074, name: "Ras al-Khaimah", subcountry: "Ra?s al Khaymah"} ];

const arr = data.map(city => city.name + ", " + city.country);

console.log(arr);

反對回復 2023-09-21

尚方寶劍之說

TA貢獻1788條經驗獲得超4個贊

const data = [{country: "Andorra", geonameid: 3040051, name: "les Escaldes", subcountry: "Escaldes-Engordany"},

{country: "Andorra", geonameid: 3041563, name: "Andorra la Vella", subcountry: "Andorra la Vella"},

{country: "United Arab Emirates", geonameid: 290594, name: "Umm al Qaywayn", subcountry: "Umm al Qaywayn"},

{country: "United Arab Emirates", geonameid: 291074, name: "Ras al-Khaimah", subcountry: "Ra?s al Khaymah"}]

const arr = data.map(i => `${i.name} , ${i.country}`);

console.log(arr)

反對回復 2023-09-21

慕尼黑的夜晚無繁華

TA貢獻1864條經驗獲得超6個贊

forEach 的簡單解決方案

countries = [

{country: "Andorra", geonameid: 3040051, name: "les Escaldes", subcountry: "Escaldes-Engordany"},

{country: "Andorra", geonameid: 3041563, name: "Andorra la Vella", subcountry: "Andorra la Vella"},

{country: "United Arab Emirates", geonameid: 290594, name: "Umm al Qaywayn", subcountry: "Umm al Qaywayn"},

{country: "United Arab Emirates", geonameid: 291074, name: "Ras al-Khaimah", subcountry: "Ra?s al Khaymah"}

]

let arr = [];

let result = [];

countries.forEach((country, index) => {

let nameStr = `${country.name}, ${country.country}`

result.push(nameStr);

})

console.log(result)

//output

//["les Escaldes Andorra", "Andorra la Vella Andorra", "Umm al Qaywayn United Arab Emirates", "Ras al-Khaimah United Arab Emirates"]

反對回復 2023-09-21

阿波羅的戰車

TA貢獻1862條經驗獲得超6個贊

如果您愿意，可以使用reduce函數：

arr.reduce((acc, curr) => [...acc, (`${curr.name}, ${curr.country}`)], []);

它將以您想要的格式返回您的值。

下面的例子。

const arr = [

{country: 'Andorra', geonameid: 3040051, name: 'les 1', subcountry: 'Escaldes-Engordany'},

{country: 'Turkey', geonameid: 3040021, name: 'les Escaldes', subcountry: 'aaaa'},

{country: 'IDK', geonameid: 3040021, name: 'Wow', subcountry: 'aaaa'}

];

const custom = arr.reduce((acc, curr) => [...acc, (`${curr.name}, ${curr.country}`)], []);

console.log(custom);

反對回復 2023-09-21

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從 JSON 文件獲取特定鍵/值對的數組

從 JSON 文件獲取特定鍵/值對的數組

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