Exploring the attributes of array elements

Consider an array like the following:

[
{ "user": "tom",
  "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="13767653707c3d707c7e">[email protected]</a>"
},
{ "user": "james",
  "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="fa9898ba9995d4999597">[email protected]</a>"
},
{ "user": "ryan",
  "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="f48686b4979bda979b99">[email protected]</a>"
}
]

However, the order of the objects is not guaranteed. If you need to check if ryan, or any other user, exists in one of these objects, how would you approach it?

javascriptmocha.js

Answer №1

If you're currently utilizing lodash library (or considering it), my recommendation would be to use its find method:

_.find(array, { user: "ryan" })

Alternatively, if you prefer to avoid lodash and keep it concise, you can achieve the same with vanilla JavaScript:

array.find(elem => elem.user === "ryan")

Both options will result in undefined if no matching element is found.

Answer №2

This function will return true if the array includes the user ryan.

var input = [
{ "user": "tom",
  "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="21444461424e0f424e4c">[email protected]</a>"
},
{ "user": "james",
  "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="f39191b3909cdd909c9e">[email protected]</a>"
},
{ "user": "ryan",
  "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="04767644676b2a676b69">[email protected]</a>"
}
]
var output = input.some(function(eachRow){
    return eachRow.user === 'ryan';
});

console.log(output);

Answer №3

One approach I take to address this issue is by extracting the desired fields into arrays and then reviewing their values.

const chai = require('chai');
const expect = chai.expect;

describe('unit test', function() {
  it('executes test', function() {
    const users = [
      { "user": "tom",
        "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="7f1a1a3f1c10511c1012">[email protected]</a>"
      },
      { "user": "james",
        "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b3d1d1f3d0dc9dd0dcde">[email protected]</a>"
      },
      { "user": "ryan",
        "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="8af8f3ebe4cae9e5a4e9e5e7">[email protected]</a>"
      }
    ];
    const names = extractField(users, 'user'); // ['tom', 'james', 'ryan']   

    expect(names).to.include('ryan');
  });

  function extractField(users, fieldName) {
    return users.map(user => user[fieldName]);
  }
});

I rely on chai for making assertions. If we need to verify other fields, we can simply utilize the extraction methods.

const emails = extractField(users, 'email');
expect(emails).to.include('ryan');

This solution may prove beneficial!

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