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TrueQ
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TrueQ

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TrueQ[expr]

yields True if expr is True, and yields False otherwise.

Details

  • You can use TrueQ to "assume" that a test fails when its outcome is not clear.
  • TrueQ[expr] is equivalent to If[expr,True,False,False].

Examples

Basic Examples  (1)Summary of the most common use cases

TrueQ will return True only if the input is explicitly True:

In[1]:=1
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https://wolfram.com/xid/0bimpoeb-demojp
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0bimpoeb-gg30b3
Out[2]=2
In[3]:=3
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https://wolfram.com/xid/0bimpoeb-bc8fty
Out[3]=3
Wolfram Research (1988), TrueQ, Wolfram Language function, https://reference.wolfram.com/language/ref/TrueQ.html.
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Wolfram Research (1988), TrueQ, Wolfram Language function, https://reference.wolfram.com/language/ref/TrueQ.html.

Text

Wolfram Research (1988), TrueQ, Wolfram Language function, https://reference.wolfram.com/language/ref/TrueQ.html.

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Wolfram Research (1988), TrueQ, Wolfram Language function, https://reference.wolfram.com/language/ref/TrueQ.html.

CMS

Wolfram Language. 1988. "TrueQ." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/TrueQ.html.

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Wolfram Language. 1988. "TrueQ." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/TrueQ.html.

APA

Wolfram Language. (1988). TrueQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/TrueQ.html

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Wolfram Language. (1988). TrueQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/TrueQ.html

BibTeX

@misc{reference.wolfram_2025_trueq, author="Wolfram Research", title="{TrueQ}", year="1988", howpublished="\url{https://reference.wolfram.com/language/ref/TrueQ.html}", note=[Accessed: 28-April-2025 ]}

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@misc{reference.wolfram_2025_trueq, author="Wolfram Research", title="{TrueQ}", year="1988", howpublished="\url{https://reference.wolfram.com/language/ref/TrueQ.html}", note=[Accessed: 28-April-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_trueq, organization={Wolfram Research}, title={TrueQ}, year={1988}, url={https://reference.wolfram.com/language/ref/TrueQ.html}, note=[Accessed: 28-April-2025 ]}

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@online{reference.wolfram_2025_trueq, organization={Wolfram Research}, title={TrueQ}, year={1988}, url={https://reference.wolfram.com/language/ref/TrueQ.html}, note=[Accessed: 28-April-2025 ]}