To see the difference, try:
shallow_copy[0][2] = 4;
console.dir(test);
You'll see that test has been modified! This is because while you may have copied the values to the new array, the nested array is still the same one.
A deep copy would recursively perform shallow copies until everything is a new copy of the original.
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A deep copying means that value of the new variable is disconnected from the original variable while a shallow copy means that some values are still connected to ...
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A deep copy would recursively perform shallow copies until everything is a new copy of the original.
That means, whenever you create a copy of a variable of primitive data type, the value is copied to a new memory location to which the new variable is pointing to.
Forget about deep copy, even shallow copy isn't safe, if the object you're copying has a property with enumerable attribute set to false. MDN :.