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Stack[]

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

Stack[pattern]

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

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Stack

Stack[]

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

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

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Basic Examples  (2)

Print the stack where the Stack command is being evaluated:

Print the detailed stack contents including function arguments:

Scope  (1)

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

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

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

Wolfram Research (1991), Stack, Wolfram Language function, https://reference.wolfram.com/language/ref/Stack.html.

Text

Wolfram Research (1991), Stack, Wolfram Language function, https://reference.wolfram.com/language/ref/Stack.html.

CMS

Wolfram Language. 1991. "Stack." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/Stack.html.

APA

Wolfram Language. (1991). Stack. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Stack.html

BibTeX

@misc{reference.wolfram_2025_stack, author="Wolfram Research", title="{Stack}", year="1991", howpublished="\url{https://reference.wolfram.com/language/ref/Stack.html}", note=[Accessed: 07-August-2025]}

BibLaTeX

@online{reference.wolfram_2025_stack, organization={Wolfram Research}, title={Stack}, year={1991}, url={https://reference.wolfram.com/language/ref/Stack.html}, note=[Accessed: 07-August-2025]}