What is the difference between a shallow copy and a deep copy with JavaScript arrays? [duplicate]

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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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