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KeySelect

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KeySelect[assoc,crit]

selects elements in the association assoc for which crit applied to their keys is True.

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KeySelect[crit]

represents an operator form of KeySelect that can be applied to an expression.

Details

Examples

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Basic Examples  (3)Summary of the most common use cases

Select entries with odd keys:

In[1]:=1
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https://wolfram.com/xid/0j5avhm6-uou34
Out[1]=1

Select entries from an association, using another association as a criterion:

In[1]:=1
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https://wolfram.com/xid/0j5avhm6-uerep
Out[1]=1

Use the operator form of KeySelect:

In[1]:=1
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https://wolfram.com/xid/0j5avhm6-836t6x
Out[1]=1

Properties & Relations  (1)Properties of the function, and connections to other functions

Compute KeySelect in parallel:

In[1]:=1
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https://wolfram.com/xid/0j5avhm6-8hbu8x
Out[1]=1
Wolfram Research (2014), KeySelect, Wolfram Language function, https://reference.wolfram.com/language/ref/KeySelect.html.
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Wolfram Research (2014), KeySelect, Wolfram Language function, https://reference.wolfram.com/language/ref/KeySelect.html.

Text

Wolfram Research (2014), KeySelect, Wolfram Language function, https://reference.wolfram.com/language/ref/KeySelect.html.

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Wolfram Research (2014), KeySelect, Wolfram Language function, https://reference.wolfram.com/language/ref/KeySelect.html.

CMS

Wolfram Language. 2014. "KeySelect." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/KeySelect.html.

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Wolfram Language. 2014. "KeySelect." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/KeySelect.html.

APA

Wolfram Language. (2014). KeySelect. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/KeySelect.html

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Wolfram Language. (2014). KeySelect. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/KeySelect.html

BibTeX

@misc{reference.wolfram_2025_keyselect, author="Wolfram Research", title="{KeySelect}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/KeySelect.html}", note=[Accessed: 08-July-2025 ]}

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@misc{reference.wolfram_2025_keyselect, author="Wolfram Research", title="{KeySelect}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/KeySelect.html}", note=[Accessed: 08-July-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_keyselect, organization={Wolfram Research}, title={KeySelect}, year={2014}, url={https://reference.wolfram.com/language/ref/KeySelect.html}, note=[Accessed: 08-July-2025 ]}

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@online{reference.wolfram_2025_keyselect, organization={Wolfram Research}, title={KeySelect}, year={2014}, url={https://reference.wolfram.com/language/ref/KeySelect.html}, note=[Accessed: 08-July-2025 ]}