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OrderlessPatternSequence
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OrderlessPatternSequence

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is a pattern object that represents a sequence of arguments matching p1,p2,… in any order.

Details

Examples

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

Match elements of a list in any order:

In[1]:=1
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https://wolfram.com/xid/0bc6zz97w6gyib2-bqdvwf
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0bc6zz97w6gyib2-f6d0yy
Out[2]=2

Match function arguments in any order:

In[1]:=1
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https://wolfram.com/xid/0bc6zz97w6gyib2-tqcaa
Out[1]=1

The ordering of matched expressions is preserved:

In[1]:=1
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https://wolfram.com/xid/0bc6zz97w6gyib2-el5315
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0bc6zz97w6gyib2-ba5j6x
Out[2]=2

Scope  (2)Survey of the scope of standard use cases

Use OrderlessPatternSequence to make some of the function arguments orderless:

In[1]:=1
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https://wolfram.com/xid/0bc6zz97w6gyib2-px7fq
In[2]:=2
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https://wolfram.com/xid/0bc6zz97w6gyib2-pec2w1
Out[2]=2
In[3]:=3
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https://wolfram.com/xid/0bc6zz97w6gyib2-dilli5
Out[3]=3

Only the last two arguments of g are orderless:

In[4]:=4
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https://wolfram.com/xid/0bc6zz97w6gyib2-e1rova
Out[4]=4

Find the positions of lists that have two 1s and one 0:

In[1]:=1
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https://wolfram.com/xid/0bc6zz97w6gyib2-etl25n
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0bc6zz97w6gyib2-cbvxna
Out[2]=2

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

During expression pattern matching, PatternSequence matches expressions in fixed order:

In[1]:=1
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https://wolfram.com/xid/0bc6zz97w6gyib2-begbju
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0bc6zz97w6gyib2-5gs1ep
Out[2]=2

OrderlessPatternSequence matches expressions in arbitrary order:

In[3]:=3
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https://wolfram.com/xid/0bc6zz97w6gyib2-ir2ij4
Out[3]=3
In[4]:=4
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https://wolfram.com/xid/0bc6zz97w6gyib2-buskcg
Out[4]=4

Possible Issues  (1)Common pitfalls and unexpected behavior

OrderlessPatternSequence matches against a sequence of patterns:

In[1]:=1
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https://wolfram.com/xid/0bc6zz97w6gyib2-9f7jhv
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0bc6zz97w6gyib2-fz18c5
Out[2]=2
Wolfram Research (2015), OrderlessPatternSequence, Wolfram Language function, https://reference.wolfram.com/language/ref/OrderlessPatternSequence.html.
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Wolfram Research (2015), OrderlessPatternSequence, Wolfram Language function, https://reference.wolfram.com/language/ref/OrderlessPatternSequence.html.

Text

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

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

CMS

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

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

APA

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

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

BibTeX

@misc{reference.wolfram_2025_orderlesspatternsequence, author="Wolfram Research", title="{OrderlessPatternSequence}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/OrderlessPatternSequence.html}", note=[Accessed: 19-June-2025 ]}

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@misc{reference.wolfram_2025_orderlesspatternsequence, author="Wolfram Research", title="{OrderlessPatternSequence}", year="2015", howpublished="\url{https://reference.wolfram.com/language/ref/OrderlessPatternSequence.html}", note=[Accessed: 19-June-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_orderlesspatternsequence, organization={Wolfram Research}, title={OrderlessPatternSequence}, year={2015}, url={https://reference.wolfram.com/language/ref/OrderlessPatternSequence.html}, note=[Accessed: 19-June-2025 ]}

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@online{reference.wolfram_2025_orderlesspatternsequence, organization={Wolfram Research}, title={OrderlessPatternSequence}, year={2015}, url={https://reference.wolfram.com/language/ref/OrderlessPatternSequence.html}, note=[Accessed: 19-June-2025 ]}