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StringJoin—Wolfram Documentation

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"s1"<>"s2"<>…, StringJoin["s1","s2",…], or StringJoin[{"s1","s2",…}]

yields a string consisting of a concatenation of the si.

Details
Details and Options Details and Options
Background & Context
Examples  
Basic Examples  
Scope  
Applications  
Properties & Relations  
Possible Issues  
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Tech Notes
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StringJoin

"s1"<>"s2"<>…, StringJoin["s1","s2",…], or StringJoin[{"s1","s2",…}]

yields a string consisting of a concatenation of the si.

Details

Background & Context

Examples

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Basic Examples  (2)

Join strings:

Wolfram Language code: "abcd" <> "ABCD" <> "xyz"

Use InputForm to show string quotes:

Wolfram Language code: InputForm[%]

All lists are ignored:

Wolfram Language code: StringJoin[{{"AB", "CD"}, "XY"}]

Scope  (4)

StringJoin works with special characters:

Wolfram Language code: "αβγ" <> "⊕⊗" <> " ↵"

Join strings, with a newline in between:

Wolfram Language code: "one" <> " " <> "two"

StringJoin preserves formatting information embedded in strings:

Wolfram Language code: "red" <> "blue"

Join biomolecular sequences:

Wolfram Language code: StringJoin[BioSequence["DNA", "A"], BioSequence["DNA", "C"]]

Applications  (4)

Iteratively join a string to its reverse:

Wolfram Language code: NestList[# <> StringReverse[#]&, "AB", 5]

Find trigrams in a string:

Wolfram Language code: data = Partition[Characters["aabcaabc"], 3, 1]
Wolfram Language code: StringJoin /@ data

Join a list of words, after inserting spaces in between:

Wolfram Language code: Riffle[{"dog", "cat", "sheep", "cow"}, " "]
Wolfram Language code: StringJoin[%]

Create a Champernowne number:

Wolfram Language code: ToExpression[StringJoin["0.", ToString /@ Range[30]]]

Properties & Relations  (1)

StringJoin acts as a kind of inverse to Characters:

Wolfram Language code: Characters["abcdefg"]
Wolfram Language code: StringJoin[%]

Possible Issues  (1)

StringJoin works only with explicit strings:

Wolfram Language code: "item " <> 456

Use ToString to convert to a string:

Wolfram Language code: "item " <> ToString[456]
Wolfram Research (1988), StringJoin, Wolfram Language function, https://reference.wolfram.com/language/ref/StringJoin.html (updated 2020).

Text

Wolfram Research (1988), StringJoin, Wolfram Language function, https://reference.wolfram.com/language/ref/StringJoin.html (updated 2020).

CMS

Wolfram Language. 1988. "StringJoin." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2020. https://reference.wolfram.com/language/ref/StringJoin.html.

APA

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

BibTeX

@misc{reference.wolfram_2026_stringjoin, author="Wolfram Research", title="{StringJoin}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/StringJoin.html}", note=[Accessed: 14-November-2026]}

BibLaTeX

@online{reference.wolfram_2026_stringjoin, organization={Wolfram Research}, title={StringJoin}, year={2020}, url={https://reference.wolfram.com/language/ref/StringJoin.html}, note=[Accessed: 14-November-2026]}