I have a array like below.
cont arr= [ { id: 1, username: 'fred' }, { id: 2, username: 'bill' }, { id: 2, username: 'ted' } ]
Can I know how to verify a 'username' is exist in the array object?
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or return true if all objects in array has value in property or Checking an array if all objects inside contains a given key value(javascript) if looking for specific valuepilchard– pilchard2022-11-21 09:00:04 +00:00Commented Nov 21, 2022 at 9:00
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1 Answer
if you want to check if a key exist in all elements of the array you can do this
const arr= [ { id: 1, username: 'fred' }, { id: 2, username: 'bill' }, { id: 2, username: 'ted' } ]
const existsKey = (data, key) => data.every(d => d.hasOwnProperty(key))
console.log('username', existsKey(arr, 'username'))
console.log('anotherKey', existsKey(arr, 'anotherKey'))