The getInt8() method of DataView instances reads 1 byte at the specified byte offset of this DataView and interprets it as an 8-bit signed integer.

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The slice() method of ArrayBuffer instances returns a new ArrayBuffer whose contents are a copy of this ArrayBuffer's bytes from start, inclusive, up to end, exclusive. If either start or end is negative, it refers to an index from the end of the array, as opposed to from the beginning.

The some() method of Iterator instances is similar to Array.prototype.some(): it tests whether at least one element produced by the iterator passes the test implemented by the provided function. It returns a boolean value.

The BigInt.asIntN() static method truncates a BigInt value to the given number of least significant bits and returns that value as a signed integer.

The BigInt.asUintN() static method truncates a BigInt value to the given number of least significant bits and returns that value as an unsigned integer.

The JSON.stringify() static method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified.

The valueOf() method of BigInt values returns the wrapped primitive value of a BigInt object.

The keys() method of Set instances is an alias for the values() method.

The entries() method of Set instances returns a new set iterator object that contains an array of [value, value] for each element in this set, in insertion order. For Set objects there is no key like in Map objects. However, to keep the API similar to the Map object, each entry has the same value for its key and value here, so that an array [value, value] is returned.