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AskedValue
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AskedValue

[Experimental]

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AskedValue["key"]

is a construct for use inside AskFunction that gives the value associated with key, or Missing[…] if none has been provided.

Details

  • If a value has already been associated with a key, AskedValue returns that value just like Ask. But unlike Ask, AskedValue will never request a value from the user, instead returning Missing[…] if no value has yet been provided.
  • When no value is yet known for the requested key, AskedValue["key"] returns Missing["NotAsked","key"].

Examples

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

AskedValue returns the value whenever it is already known:

In[1]:=1
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https://wolfram.com/xid/0dc1u128mwje-508e5j
Out[1]=1

But returns a Missing object whenever it is not known yet:

In[2]:=2
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https://wolfram.com/xid/0dc1u128mwje-qh2r4m
Out[2]=2

AskedValue returns the value without causing a form to be displayed:

In[1]:=1
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https://wolfram.com/xid/0dc1u128mwje-flafkd
Out[1]=1
Wolfram Research (2016), AskedValue, Wolfram Language function, https://reference.wolfram.com/language/ref/AskedValue.html.
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Wolfram Research (2016), AskedValue, Wolfram Language function, https://reference.wolfram.com/language/ref/AskedValue.html.

Text

Wolfram Research (2016), AskedValue, Wolfram Language function, https://reference.wolfram.com/language/ref/AskedValue.html.

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Wolfram Research (2016), AskedValue, Wolfram Language function, https://reference.wolfram.com/language/ref/AskedValue.html.

CMS

Wolfram Language. 2016. "AskedValue." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/AskedValue.html.

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Wolfram Language. 2016. "AskedValue." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/AskedValue.html.

APA

Wolfram Language. (2016). AskedValue. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/AskedValue.html

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Wolfram Language. (2016). AskedValue. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/AskedValue.html

BibTeX

@misc{reference.wolfram_2025_askedvalue, author="Wolfram Research", title="{AskedValue}", year="2016", howpublished="\url{https://reference.wolfram.com/language/ref/AskedValue.html}", note=[Accessed: 29-March-2025 ]}

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@misc{reference.wolfram_2025_askedvalue, author="Wolfram Research", title="{AskedValue}", year="2016", howpublished="\url{https://reference.wolfram.com/language/ref/AskedValue.html}", note=[Accessed: 29-March-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_askedvalue, organization={Wolfram Research}, title={AskedValue}, year={2016}, url={https://reference.wolfram.com/language/ref/AskedValue.html}, note=[Accessed: 29-March-2025 ]}

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@online{reference.wolfram_2025_askedvalue, organization={Wolfram Research}, title={AskedValue}, year={2016}, url={https://reference.wolfram.com/language/ref/AskedValue.html}, note=[Accessed: 29-March-2025 ]}