Stack

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`Stack`

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Stack[]

shows the current evaluation stack, giving a list of the tags associated with evaluations that are currently being done.

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Stack[pattern]

gives a list of expressions currently being evaluated which match the pattern.

Details

Stack[_] shows all expressions currently being evaluated.
You can call Stack from inside a dialog to see how the dialog was reached.
In the list returned by Stack[pattern], each expression is wrapped with HoldForm.
The maximum length of Stack[] is limited by $RecursionLimit.
Stack has attribute HoldFirst.

Examples

open allclose all

Basic Examples (2)Summary of the most common use cases

Print the stack where the Stack command is being evaluated:

In[1]:=1

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https://wolfram.com/xid/0gipbs-oiyu0

Out[1]=1

Print the detailed stack contents including function arguments:

In[1]:=1

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https://wolfram.com/xid/0gipbs-c82qbi

Out[1]=1

Scope (1)Survey of the scope of standard use cases

Use Stack inside of Dialog to see how it was reached:

In[1]:=1

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https://wolfram.com/xid/0gipbs-dcepn2

Out[1]=1

Stack shows that the dialog from 2*Dialog[] is entered first:

In[2]:=2

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https://wolfram.com/xid/0gipbs-dpy7mr

(Dialog) Out[2]=2

In[3]:=3

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https://wolfram.com/xid/0gipbs-fi38aw

Upon return from the first dialog, the other is entered:

In[4]:=4

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https://wolfram.com/xid/0gipbs-e6ny9c

(Dialog) Out[4]=4

In[5]:=5

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https://wolfram.com/xid/0gipbs-6thkp

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