score:3

Accepted answer
// As in your comments you said your dictionary is like following:
//in case your dictionary is an Array
const Dictionary = [ ]; 
Dictionary.push({ key: PersonId , value: PersonDescription })

//in this case you can do this:

const newDictionary = Dictionary.filter(item => item.key !== id)
// newDictionary is an Array without the item with key === id

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