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Get an array of symbols defined on an object.
Symbols are an ES2015 feature, and this method was introduced in ES2015 as well.
Example:
const dog = {}
const r = Symbol('Roger')
const s = Symbol('Syd')
dog[r] = {
name: 'Roger',
age: 6
}
dog[s] = {
name: 'Syd',
age: 5
}
Object.getOwnPropertySymbols(dog) //[ Symbol(Roger), Symbol(Syd) ]