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Sequence
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Sequence

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Sequence[expr1,expr2,…]

represents a sequence of arguments to be spliced automatically into any function.

Details

Examples

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

Sequence is automatically spliced in:

In[1]:=1
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https://wolfram.com/xid/0bn5nbm-nxl
Out[1]=1

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

Replace with a sequence that is automatically spliced in:

In[1]:=1
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https://wolfram.com/xid/0bn5nbm-hjl
Out[1]=1
In[1]:=1
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https://wolfram.com/xid/0bn5nbm-g6w
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0bn5nbm-okt
Out[2]=2

Applications  (2)Sample problems that can be solved with this function

Completely flatten out all lists in the argument to a function:

In[1]:=1
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https://wolfram.com/xid/0bn5nbm-ipr
Out[1]=1

Conditionally add an element to a list by using Apply to delay the Sequence until evaluation:

In[1]:=1
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https://wolfram.com/xid/0bn5nbm-e8c2yx
In[2]:=2
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https://wolfram.com/xid/0bn5nbm-5n7rw3
Out[2]=2
In[3]:=3
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https://wolfram.com/xid/0bn5nbm-db3yxa
Out[3]=3

Properties & Relations  (5)Properties of the function, and connections to other functions

A sequence of arguments matched by __ is treated as a Sequence object:

In[1]:=1
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https://wolfram.com/xid/0bn5nbm-be5
Out[1]=1

## represents sequences of arguments by Sequence objects:

In[1]:=1
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https://wolfram.com/xid/0bn5nbm-dar
Out[1]=1

A sequence with one argument acts like Identity:

In[1]:=1
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https://wolfram.com/xid/0bn5nbm-p300mt
Out[1]=1

Functions that are HoldAllComplete do not automatically splice in Sequence objects:

In[1]:=1
✖
https://wolfram.com/xid/0bn5nbm-qpil8f
Out[1]=1

Functions that have attribute HoldAll but not SequenceHold do automatically splice:

In[2]:=2
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https://wolfram.com/xid/0bn5nbm-tucjw8
Out[2]=2
In[3]:=3
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https://wolfram.com/xid/0bn5nbm-qjm51w
Out[3]=3

An empty Sequence[] will evaporate inside any head except those with special attributes:

In[1]:=1
✖
https://wolfram.com/xid/0bn5nbm-rw3umz
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0bn5nbm-zthm1n
Out[2]=2

Nothing will only disappear inside lists:

In[3]:=3
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https://wolfram.com/xid/0bn5nbm-r3iems
Out[3]=3
In[4]:=4
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https://wolfram.com/xid/0bn5nbm-c63hxf
Out[4]=4

Possible Issues  (2)Common pitfalls and unexpected behavior

Most Wolfram Language functions automatically splice in Sequence objects:

In[1]:=1
✖
https://wolfram.com/xid/0bn5nbm-b1u
Out[1]=1

Assignment and replacement functions have the attribute SequenceHold:

In[1]:=1
✖
https://wolfram.com/xid/0bn5nbm-iur
Out[1]=1
Wolfram Research (1996), Sequence, Wolfram Language function, https://reference.wolfram.com/language/ref/Sequence.html.
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Wolfram Research (1996), Sequence, Wolfram Language function, https://reference.wolfram.com/language/ref/Sequence.html.

Text

Wolfram Research (1996), Sequence, Wolfram Language function, https://reference.wolfram.com/language/ref/Sequence.html.

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Wolfram Research (1996), Sequence, Wolfram Language function, https://reference.wolfram.com/language/ref/Sequence.html.

CMS

Wolfram Language. 1996. "Sequence." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/Sequence.html.

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Wolfram Language. 1996. "Sequence." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/Sequence.html.

APA

Wolfram Language. (1996). Sequence. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Sequence.html

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Wolfram Language. (1996). Sequence. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Sequence.html

BibTeX

@misc{reference.wolfram_2025_sequence, author="Wolfram Research", title="{Sequence}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/Sequence.html}", note=[Accessed: 09-April-2025 ]}

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@misc{reference.wolfram_2025_sequence, author="Wolfram Research", title="{Sequence}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/Sequence.html}", note=[Accessed: 09-April-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_sequence, organization={Wolfram Research}, title={Sequence}, year={1996}, url={https://reference.wolfram.com/language/ref/Sequence.html}, note=[Accessed: 09-April-2025 ]}

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@online{reference.wolfram_2025_sequence, organization={Wolfram Research}, title={Sequence}, year={1996}, url={https://reference.wolfram.com/language/ref/Sequence.html}, note=[Accessed: 09-April-2025 ]}