Performs the specified action for each node in an list.
A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
Returns an list of keys in the list.
Returns an list of values in the list.
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Returns an array of key, value pairs for every entry in the list.