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如何按ID从数组中选择对象?

lodash javascript

bier hier · 技术社区 · 6 年前

我有一个对象,其中包含一个名为applications的数组:

const persons={"entities":{"applicants":[{"lastName":"Agamemnon","isPrimaryApplicant":false,"id":"16671520038"},{"lastName":"Purdy","isPrimaryApplicant":true,"id":"16671520039"},{"lastName":"Brekky","isPrimaryApplicant":true,"id":"16671520040"},{"lastName":"Abouli","isPrimaryApplicant":true,"id":"16671520041"}]}}

如何从Entities.Applications按ID排列返回项目?

我试过这样的方法:

const applicantsById = persons.entities.applicants.find(a => a.id ===id)

console.log(applicantsById.get('16671520041'))

但我不知道怎么把身份证传进去?

codepen

5 回复 | 直到 6 年前

Nick Parsons Felix Kling 6 年前

使用 普通JavaScript :

你需要定义什么 id 在你的设定之前 applicantsById 变量。这样你就可以找到 身份证件 在对象数组中, 身份证件 你定义了。

const id = '16671520041',
applicantsById = persons.entities.applicants.find(a => a.id === id);

如果要将此项与多个ID一起使用,可以将其扩展到函数:

const persons = {"entities":{"applicants":[{"lastName":"Agamemnon","isPrimaryApplicant":false,"id":"16671520038"},{"lastName":"Purdy","isPrimaryApplicant":true,"id":"16671520039"},{"lastName":"Brekky","isPrimaryApplicant":true,"id":"16671520040"},{"lastName":"Abouli","isPrimaryApplicant":true,"id":"16671520041"}]}},
getApplicantById = _id => persons.entities.applicants.find(({id}) => id === _id);

console.log(getApplicantById('16671520041')); // Abouli obj
console.log(getApplicantById('16671520039')); // Purdy obj

或者,使用 LATASH和ES6 :

const id = "16671520041";
res = _.find(persons.entities.applicants, {id}); // Abouli obj

Karim 6 年前

applicantsById 需要是在ID上参数化的函数

const persons={"entities":{"applicants":[{"lastName":"Agamemnon","isPrimaryApplicant":false,"id":"16671520038"},{"lastName":"Purdy","isPrimaryApplicant":true,"id":"16671520039"},{"lastName":"Brekky","isPrimaryApplicant":true,"id":"16671520040"},{"lastName":"Abouli","isPrimaryApplicant":true,"id":"16671520041"}]}}

const applicantsById = id => persons.entities.applicants.find(a => a.id ===id)
console.log(applicantsById('16671520041'))

Hammad Arshad 6 年前

您应该创建一个函数。

const applicantsById = (id) => persons.entities.applicants.find(a => a.id === id)
applicantsById('16671520041')

这将返回您所需的结果

Andy 6 年前

您可以先定义您的ID,然后再执行 find :

const id = '16671520041';
const applicantsById = persons.entities.applicants.find(a => a.id ===id)

或者可以定义一个接受ID作为参数的函数。其他答案包括如何使用现代ES6箭头函数来实现这一点。如果您不熟悉它们,这里是ES5函数声明的编写方法。在这里,我还将人员数据传递给了函数。

const persons={"entities":{"applicants":[{"lastName":"Agamemnon","isPrimaryApplicant":false,"id":"16671520038"},{"lastName":"Purdy","isPrimaryApplicant":true,"id":"16671520039"},{"lastName":"Brekky","isPrimaryApplicant":true,"id":"16671520040"},{"lastName":"Abouli","isPrimaryApplicant":true,"id":"16671520041"}]}}

// Accept persons data, and an id
function getApplicantById(persons, id) {

  // Return the found applicant from the function
  return persons.entities.applicants.find(a => a.id ===id);
}

// Pass in the data, and the id to the function
const applicant = getApplicantById(persons, '16671520041');
console.log(applicant);

ellipsis 6 年前

为此使用筛选器

const persons={"entities":{"applicants":[{"lastName":"Agamemnon","isPrimaryApplicant":false,"id":"16671520038"},{"lastName":"Purdy","isPrimaryApplicant":true,"id":"16671520039"},{"lastName":"Brekky","isPrimaryApplicant":true,"id":"16671520040"},{"lastName":"Abouli","isPrimaryApplicant":true,"id":"16671520041"}]}}

console.log(get(16671520039));

function get(id)
{
return persons.entities.applicants.filter((e)=>e.id===id)
}