The following methods always create new arrays with the Array base constructor: splice() (to construct the array of removed elements that's returned).The following methods create new arrays by accessing nstructor to determine the constructor to use: Other methods mutate the array that the method was called on, in which case their return value differs depending on the method: sometimes a reference to the same array, sometimes the length of the new array. Primitive types such as strings, numbers and booleans (not String, Number, and Boolean objects): their values are copied into the new array.That is, if a referenced object is modified, the changes are visible to both the new and original arrays. Both the original and new array refer to the same object. Objects: the object reference is copied into the new array.Elements of the original array(s) are copied into the new array as follows: The copy always happens shallowly - the method never copies anything beyond the initially created array. They do so by first constructing a new array and then populating it with elements. Some methods do not mutate the existing array that the method was called on, but instead return a new array. Object.prototype._lookupSetter_() Deprecated.Object.prototype._lookupGetter_() Deprecated.Object.prototype._defineSetter_() Deprecated.

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