將文本添加到物件屬性值的開頭-有解無憂

嗨，我正在將字串 'a' 添加到name. 我還添加了一個條件，如果的值name.length === 3，則添加字串，'a '但它僅回傳更改的物件和name屬性。

var values1 = [
  {
    name: 'dog',
    surname: 'good',
    skills: 'programming',
  },
  {
    name: 'cat',
    surname: 'soft',
    skills: 'engineer',
  },
  {
    name: 'elephant',
    surname: 'big',
    skills: 'programming',
  },
];

let array = [];
for (let i = 0; i < values1.length; i  ) {
  if (values1[i]['name'].length == 3) {
    array.push({ name: 'a '   values1[i]['name'] });
  }
}

for (let i = 0; i < array.length; i  ) {
  console.log(array[i]);
}

這是我想要回傳的結果。

[
  {
    name: 'a dog',
    surname: 'good',
    skills: 'programming',
  },
  {
    name: 'a cat',
    surname: 'soft',
    skills: 'engineer',
  },
  {
    name: 'elephant',
    surname: 'big',
    skills: 'programming',
  },
];

uj5u.com熱心網友回復：

您已經很接近了，但push()您不想添加名稱鍵 ( )，而是想重新分配name欄位的值。

var values1 = [
  {
    name: 'dog',
    surname: 'good',
    skills: 'programming',
  },
  {
    name: 'cat',
    surname: 'soft',
    skills: 'engineer',
  },
  {
    name: 'elephant',
    surname: 'big',
    skills: 'programming',
  },
];

for (let i = 0; i < values1.length; i  ) {
  if (values1[i]['name'].length == 3) {
    values1[i]['name'] = 'a '   values1[i]['name'];
  }
}

console.log(values1)

我修改了現有陣列而不是添加一個新陣列。我認為這并不危險，因為我們正在更新一個原語。

uj5u.com熱心網友回復：

下面是使用的例子map()和解構的name回呼財產。

var values1 = [
  { name: 'dog', surname: 'good', skills: 'programming' },
  { name: 'cat', surname: 'soft', skills: 'engineer' },
  { name: 'elephant', surname: 'big', skills: 'programming' },
];

const result = values1.map(({ name, ...rest }) => 
  ({ name: (name.length === 3 ? `a ${name}` : name), ...rest }));

console.log(result);

但是為了讓您的代碼作業，您只需要確保推送整個物件，而不管名稱是否更改。這里使用Object.assign()創建物件的副本，name如果需要更新，然后將副本推送到陣列。

var values1 = [
  {
    name: 'dog',
    surname: 'good',
    skills: 'programming',
  },
  {
    name: 'cat',
    surname: 'soft',
    skills: 'engineer',
  },
  {
    name: 'elephant',
    surname: 'big',
    skills: 'programming',
  },
];

let array = [];
for (let i = 0; i < values1.length; i  ) {
  const obj = Object.assign({}, values1[i]);

  if (obj['name'].length === 3) {
    obj.name = 'a '   obj['name'];
  }

  array.push(obj);
}

for (let i = 0; i < array.length; i  ) {
  console.log(array[i]);
}

轉載請註明出處，本文鏈接：https://www.uj5u.com/qita/379288.html

標籤：javascript 节点.js 数组 json 目的

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