StringJoin

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`StringJoin`

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

yields a string consisting of a concatenation of the .

Details

StringJoin has attribute Flat.
StringJoin[BioSequence["type","seq"]…] will concatenate biomolecular sequences of the same type.

Background & Context

StringJoin["s₁","s₂",…], which may also be written using the shorthand notation "s₁"<>"s₂"<>⋯, returns the string formed by the concatenation of strings "s_i". StringJoin ignores lists at any level in its arguments and so may be applied to nested list structures without the need for flattening. While StringJoin works only with explicit valid strings, ToString can often be used to convert non-string expressions into string form.
StringJoin is related to a number of other symbols. In practice, StringJoin is an inverse of Characters, in the sense that StringJoin[Characters["string"]] and Characters[StringJoin[{"s","t","r","i","n","g"}]] return "string" and {"s","t","r","i","n","g"}, respectively. StringJoin is a String analog and/or generalization of the qualitatively similar functions Join, Append, Prepend, Catenate and JoinAcross. In particular, "s₁"<>"s₀" prepends and "s₀"<>"s₁" appends a string "s₁" to a given string "s₀". StringJoin should not be confused with StringExpression ("s₁"~~"s₂"~~⋯), which is used to specify string patterns. StringJoin is also related to and commonly used in conjunction with StringRiffle, StringRepeat, StringInsert, StringReplacePart and StringPartition.

Examples

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Basic Examples (2)Summary of the most common use cases

Join strings:

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-n5x

Out[1]=1

Use InputForm to show string quotes:

In[2]:=2

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https://wolfram.com/xid/0tzjyhiq-unl

All lists are ignored:

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-i7i

Out[1]=1

Scope (4)Survey of the scope of standard use cases

StringJoin works with special characters:

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-o3

Out[1]=1

Join strings, with a newline in between:

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-i96

Out[1]=1

StringJoin preserves formatting information embedded in strings:

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-nx

Out[1]=1

Join biomolecular sequences:

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-4ynthx

Out[1]=1

Applications (4)Sample problems that can be solved with this function

Iteratively join a string to its reverse:

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-en7

Out[1]=1

Find trigrams in a string:

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-rh3

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0tzjyhiq-w0w

Out[2]=2

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

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-l2l

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0tzjyhiq-v30

Out[2]=2

Create a Champernowne number:

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-ibo

Out[1]=1

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

StringJoin acts as a kind of inverse to Characters:

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-bzs

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0tzjyhiq-nbx

Out[2]=2

Possible Issues (1)Common pitfalls and unexpected behavior

StringJoin works only with explicit strings:

In[1]:=1

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https://wolfram.com/xid/0tzjyhiq-exu

Out[1]=1

Use ToString to convert to a string:

In[2]:=2

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https://wolfram.com/xid/0tzjyhiq-nxq

Out[2]=2

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