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Last active July 22, 2018 05:35
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_.js
// Creates a new array including the new item, turns it into a Set,
// which removes duplicates, and then turns it back to an array
const newCharacters = [...new Set([...characters, "Donald"])];
// Since "Donald" is a non-unique item, newCharacters will be:
// => ["Walter", "Jeffrey", "Donald"]
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