如何检查某个值是否存在于将对象作为其元素的数组中。 JavaScript

Question

The first one is when we have an array holds regular elements like strings and I know how to use Includes on it.

But how about arrays holding objects as their element? How can I check if there is a certain value in those objects?

 const arr = ['this', 'is', 'a test']; console.log(arr.includes('this')); const arr2 = [ { id: '123', name: 'Alex' }, { id: '345', name: 'Dan' }, { id: '33', name: 'Joe' }, ];

Answer 1

You can use the some function.

const arr2 = [
  { id: '123', name: 'Alex' },
  { id: '345', name: 'Dan' },
  { id: '33', name: 'Joe' },
];

console.log(arr2.some(item => item.name==="this" ))

The some() method tests whether at least one element in the array passes the test implemented by the provided function.

Answer 2

if you want a returned array of values that match = >

 const filtered = arr2.filter((item)=>item.name == 'value')

if you want bool(true||false) =>

 const filtered = arr2.filter((item)=>item.name == 'value').length > 0

or using some as mentioned above.