Use some function to check if the value exists in an array of objects in JavaScript. some is a great function for checking the existence of things in arrays:
JavaScript check if a value exists in an array of objects
Simple example code.
<!DOCTYPE html>
<html>
<body>
<script>
const arr = [{ id: 1, username: 'fred' },
{ id: 2, username: 'bill' },
{ id: 3, username: 'ted' }];
const found = arr.some(el => el.username === 'ted');
console.log('ted found',found);
</script>
</body>
</html> Output:
Add value if not exists
Loop through the array to check whether a particular username value already exists and if it does do nothing, but if it doesn’t add a new object to the array.
const arr = [{ id: 1, username: 'fred' }, { id: 2, username: 'bill' }, { id: 3, username: 'ted' }];
function add(arr, name) {
const { length } = arr;
const id = length + 1;
const found = arr.some(el => el.username === name);
if (!found) arr.push({ id, username: name });
return arr;
}
console.log(add(arr, 'ted'));Source: stackoverflow.com
Check if one element exists in an array of objects
var memberships = [{
id: 1,
type: 'guest'
},
{
id: 2,
type: 'member'
}
];
var status = memberships.some(function(el) {
return (el.type == 'member');
});
console.log(status);Do comment if you have any doubts or suggestions on this JS Array of object topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version