$NoValue

$NoValue

is a special value that can be assigned to an InitializationValue[] object to indicate that the symbol referenced by the initialization value should be initialized with no value.

Details

  • Unsetting symbols during initialization is typically done with InitializationValue[sym]=$NoValue.

Examples

Basic Examples  (1)

Unset the cloud connection at the start of a session:

Wolfram Research (2017), $NoValue, Wolfram Language function, https://reference.wolfram.com/language/ref/$NoValue.html.

Text

Wolfram Research (2017), $NoValue, Wolfram Language function, https://reference.wolfram.com/language/ref/$NoValue.html.

BibTeX

@misc{reference.wolfram_2021_$novalue, author="Wolfram Research", title="{$NoValue}", year="2017", howpublished="\url{https://reference.wolfram.com/language/ref/$NoValue.html}", note=[Accessed: 22-October-2021 ]}

BibLaTeX

@online{reference.wolfram_2021_$novalue, organization={Wolfram Research}, title={$NoValue}, year={2017}, url={https://reference.wolfram.com/language/ref/$NoValue.html}, note=[Accessed: 22-October-2021 ]}

CMS

Wolfram Language. 2017. "$NoValue." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/$NoValue.html.

APA

Wolfram Language. (2017). $NoValue. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/$NoValue.html