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CaseOrdering

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is an option for AlphabeticSort and related functions that specifies how upper versus lower case should be sorted.

Details

  • Possible settings include:
  • "LowerFirst"sort lowercase letters before uppercase letters
    "UpperFirst"sort uppercase letters before lowercase letters
    Automaticsort according to conventions in the language specified

Examples

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

With CaseOrdering"LowerFirst", the lowercase form of a character is sorted before its uppercase form:

In[1]:=1
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https://wolfram.com/xid/0b8cq5ddhu-2jntq
Out[1]=1

With CaseOrdering"UpperFirst", the uppercase form is sorted before the lowercase form:

In[2]:=2
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https://wolfram.com/xid/0b8cq5ddhu-cj1t58
Out[2]=2

Scope  (1)Survey of the scope of standard use cases

CaseOrderingAutomatic uses the ordering convention specific to a given language:

In[1]:=1
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https://wolfram.com/xid/0b8cq5ddhu-22yqx6
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0b8cq5ddhu-nno4yk
Out[2]=2
In[5]:=5
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https://wolfram.com/xid/0b8cq5ddhu-loj73j
Out[5]=5

Possible Issues  (1)Common pitfalls and unexpected behavior

IgnoreCaseTrue overrides any CaseOrdering value:

In[3]:=3
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https://wolfram.com/xid/0b8cq5ddhu-kssk60
Out[3]=3
In[2]:=2
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https://wolfram.com/xid/0b8cq5ddhu-go4jcy
Out[2]=2
Wolfram Research (2015), CaseOrdering, Wolfram Language function, https://reference.wolfram.com/language/ref/CaseOrdering.html.
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Wolfram Research (2015), CaseOrdering, Wolfram Language function, https://reference.wolfram.com/language/ref/CaseOrdering.html.

Text

Wolfram Research (2015), CaseOrdering, Wolfram Language function, https://reference.wolfram.com/language/ref/CaseOrdering.html.

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Wolfram Research (2015), CaseOrdering, Wolfram Language function, https://reference.wolfram.com/language/ref/CaseOrdering.html.

CMS

Wolfram Language. 2015. "CaseOrdering." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/CaseOrdering.html.

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Wolfram Language. 2015. "CaseOrdering." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/CaseOrdering.html.

APA

Wolfram Language. (2015). CaseOrdering. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/CaseOrdering.html

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Wolfram Language. (2015). CaseOrdering. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/CaseOrdering.html

BibTeX

@misc{reference.wolfram_2025_caseordering, author="Wolfram Research", title="{CaseOrdering}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/CaseOrdering.html}", note=[Accessed: 20-June-2025 ]}

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@misc{reference.wolfram_2025_caseordering, author="Wolfram Research", title="{CaseOrdering}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/CaseOrdering.html}", note=[Accessed: 20-June-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_caseordering, organization={Wolfram Research}, title={CaseOrdering}, year={2015}, url={https://reference.wolfram.com/language/ref/CaseOrdering.html}, note=[Accessed: 20-June-2025 ]}

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@online{reference.wolfram_2025_caseordering, organization={Wolfram Research}, title={CaseOrdering}, year={2015}, url={https://reference.wolfram.com/language/ref/CaseOrdering.html}, note=[Accessed: 20-June-2025 ]}