Objects and arrays are passed by reference in JS, that is, if referenced by other variables or passed as arguments, changes to the latter ones affects also the originals. Sometimes copying the object in a shallow way (one level deep) is not enough, because there could be internal objects that are in turn passed by reference.
This is not entirely correct.
In Javascript primitives and objects are always called by value, and the value that is passed is a reference. This means that the reference to an Object is copied and passed as a value.
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This is not entirely correct.
In Javascript primitives and objects are always called by value, and the value that is passed is a reference. This means that the reference to an Object is copied and passed as a value.