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從 JSON 文件獲取特定鍵/值對的數(shù)組

從 JSON 文件獲取特定鍵/值對的數(shù)組

慕的地6264312 2023-09-21 16:56:57
初學(xué)者 - 我想從 JSON 文件為我的世界城市類型提前項(xiàng)目創(chuàng)建一個數(shù)組。我已經(jīng)獲取了數(shù)據(jù)，現(xiàn)在我想提取 2 個鍵/值對（稱為名稱/國家/地區(qū)）并將它們推送到一個新的字符串?dāng)?shù)組中，該數(shù)組的語法如下：const arr = ["name, country", "name, country", "name, country"...]以下是數(shù)據(jù)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(huán)，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(xiàn)2012條經(jīng)驗(yàn) 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(shù)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);


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?
尚方寶劍之說

TA貢獻(xiàn)1788條經(jīng)驗(yàn) 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)


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?
慕尼黑的夜晚無繁華

TA貢獻(xiàn)1864條經(jīng)驗(yàn) 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"]

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?
阿波羅的戰(zhàn)車

TA貢獻(xiàn)1862條經(jīng)驗(yàn) 獲得超6個贊

如果您愿意，可以使用reduce函數(shù)：


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);


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