javascript - 检查并添加数组对象中的属性

Question

我在下面有一个非常具体的格式详细信息的对象/输出:

result = 
AB: [ 0:{Name: "Tom", team:"Spirit", position: "Defender", score: 22 }
    1:{Name: "Paul", team:"Vikings", position: "center" }
    2:{Name: "Jim", team:"United", position: "Wing", }
    3:{Name: "Greg", team:"Crusaders", position: "Fullback", score: 54}
    4:{Name: "Tim", team:"Vikings", position: "Fullback", score: 77 }
    ]
CD: [0:{...},1:{...},2:{...},3:{...},4:{...}]
EF: [0:{...},1:{...},2:{...},3:{...},4:{...}]
GH: [0:{...},1:{...},2:{...},3:{...},4:{...}]

结果有嵌套数组。在某些输出中，score 的属性不存在，但我需要它存在 - 如果它不存在，我需要将其默认添加为 score:"" 如果它存在有没有然后就不管它了。

我已经能够添加 score 的属性，但只能在结果对象的顶层添加，例如

...
    GH: [0:{...},1:{...},2:{...},3:{...},4:{...}]
    score:""

通过

 if(result.hasOwnProperty("score")) {
     alert('Item has already that property');
 } else {
     result.score = "" ;
 }

我可以通过(下方)定位特定路径，但我想将其应用于所有路径:

 if(finalResult['AB'][1].hasOwnProperty("durabilityScore")) {
    alert('Item has already that property');
} else {
    finalResult['AB'][1].durabilityScore = 'value';
}

如果有帮助，我正在使用 Lodash。谢谢

Answer 1

您可以迭代对象和数组的值。然后检查该属性是否存在，如果不存在则赋值。

此解决方案不会覆盖 falsy值(0、''、false、undefined、null)，其中如果使用默认检查就会发生，比如

o.score = o.score || ''

var result = { AB: [{ Name: "Tom", team:"Spirit", position: "Defender", score: 22 }, { Name: "Paul", team:"Vikings", position: "center" }, { Name: "Jim", team:"United", position: "Wing" }, { Name: "Greg", team:"Crusaders", position: "Fullback", score: 54 }, { Name: "Tim", team:"Vikings", position: "Fullback", score: 77 }] };

Object.values(result).forEach(a => a.forEach(o => 'score' in o || (o.score = '')));

console.log(result);

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