Empty string - Revision history

Symbol & Font Hunter: /* Use in programming languages */

2025-02-07T17:44:24Z

Use in programming languages

← Previous revision		Revision as of 17:44, 7 February 2025
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	\|-		\|-
	\| <code>""</code>		\| <code>""</code>
	\| [[C (programming language)\|C]], [[C Sharp (programming language)\|C#]], [[C++]], [[Go (programming language)\|Go]], [[Haskell (programming language)\|Haskell]], [[Java (programming language)\|Java]], [[JavaScript]], [[Julia (programming language)\|Julia]], [[Lua (programming language)\|Lua]], [[MUMPS\|M]], [[Objective-C]] (as a C string), [[OCaml]], [[Perl]], [[PHP]], [[Python (programming language)\|Python]], [[Ruby (programming language)\|Ruby]], [[Scala (programming language)\|Scala]], [[Standard ML]], [[Swift (programming language)\|Swift]], [[Tcl]], [[Visual Basic .NET]]		\| [[C (programming language)\|C]], [[C Sharp (programming language)\|C#]], [[C++]], [[Go (programming language)\|Go]], [[Haskell (programming language)\|Haskell]], [[Java (programming language)\|Java]], [[JavaScript]], [[Julia (programming language)\|Julia]], [[Lua (programming language)\|Lua]], [[MUMPS\|M]], [[Objective-C]] (as a C string), [[OCaml]], [[Perl]], [[PHP]], [[PowerShell]], [[Python (programming language)\|Python]], [[Ruby (programming language)\|Ruby]], [[Scala (programming language)\|Scala]], [[Standard ML]], [[Swift (programming language)\|Swift]], [[Tcl]], [[Visual Basic .NET]]
	\|-		\|-
	\| <code>''</code>		\| <code>''</code>
	\| [[APL (programming language)\|APL]], [[Delphi (programming language)\|Delphi]], [[JavaScript]], [[Lua (programming language)\|Lua]], [[MATLAB]], [[Pascal (programming language)\|Pascal]], [[Perl]], [[PHP]], [[Python (programming language)\|Python]], [[R (programming language)\|R]], [[Ruby (programming language)\|Ruby]], [[Smalltalk]], [[SQL]]		\| [[APL (programming language)\|APL]], [[Delphi (programming language)\|Delphi]], [[JavaScript]], [[Lua (programming language)\|Lua]], [[MATLAB]], [[Pascal (programming language)\|Pascal]], [[Perl]], [[PHP]], [[PowerShell]], [[Python (programming language)\|Python]], [[R (programming language)\|R]], [[Ruby (programming language)\|Ruby]], [[Smalltalk]], [[SQL]]
	\|-		\|-
	\| <code>character(0)</code>		\| <code>character(0)</code>
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	\| <code><nowiki>[[]]</nowiki></code>		\| <code><nowiki>[[]]</nowiki></code>
	\| [[Lua (programming language)\|Lua]]		\| [[Lua (programming language)\|Lua]]
			\|-
			\|<code>“”</code>
			<code>‘’</code>
			\|[[PowerShell]]
	\|}		\|}

Electrio 1: /* Use in programming languages */ added footnote

2025-02-06T16:00:25Z

Use in programming languages: added footnote

← Previous revision		Revision as of 16:00, 6 February 2025
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	\| [[Perl]]		\| [[Perl]]
	\|-		\|-
			\| <code>str()</code><ref>Another way to make an empty string is multiplying a string by 0 or a negative integer.</ref>
	\| <code>str()</code>
	\| [[Python (programming language)\|Python]]		\| [[Python (programming language)\|Python]]
	\|-		\|-

100.36.106.199: /* See also */ already linked in the article

2025-01-30T21:39:30Z

100.36.106.199: /* Representations of the empty string */ avoid pipe to redirect, minor prose polish

2025-01-30T21:39:08Z

Representations of the empty string: avoid pipe to redirect, minor prose polish

← Previous revision		Revision as of 21:39, 30 January 2025
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	=== Representations of the empty string ===		=== Representations of the empty string ===
	{{Expand section\|date=March 2010}}		{{Expand section\|date=March 2010}}
	The empty string is a syntactically valid representation of [[~~0 (number)\|~~zero]] in [[positional notation]] (in any base), which does not contain [[leading zero]]s. Since the empty string does not have a standard visual representation outside of formal language theory, the number zero is traditionally represented by a single [[decimal digit]] '''0''' instead.		The empty string is a syntactically valid representation of [[zero]] in [[positional notation]] (in any base), which does not contain [[leading zero]]s. Since the empty string does not have a standard visual representation outside of formal language theory, the number zero is traditionally represented by a single [[decimal digit]] '''0''' instead.

	Zero-filled memory area, interpreted as a [[null-terminated string]], is an empty string.		Zero-filled memory area, interpreted as a [[null-terminated string]], is an empty string.

	Empty lines of text show the empty string. This can occur from two consecutive [[End of line\|EOLs]], as often occur in [[text file]]s, ~~and this~~ is sometimes used in [[text processing]] to separate [[paragraph]]s, e.g. in [[MediaWiki]].		Empty lines of text show the empty string. This can occur from two consecutive [[End of line\|EOLs]], as often occur in [[text file]]s. This is sometimes used in [[text processing]] to separate [[paragraph]]s, e.g. in [[MediaWiki]].

	==See also==		==See also==

النظاري at 11:08, 30 January 2025

2025-01-30T11:08:15Z

← Previous revision		Revision as of 11:08, 30 January 2025
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	* [[Concatenation theory]]		* [[Concatenation theory]]
	* [[String literal]]		* [[String literal]]
			* [[0]]

	==References==		==References==

Maproom: /* Examples of empty strings */ There is only one empty string: all empty strings are identical. This section is about representations of it.

2025-01-27T09:42:55Z

Examples of empty strings: There is only one empty string: all empty strings are identical. This section is about representations of it.

← Previous revision		Revision as of 09:42, 27 January 2025
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	\|}		\|}

	=== ~~Examples~~ of empty ~~strings~~ ===		=== Representations of the empty string ===
	{{Expand section\|date=March 2010}}		{{Expand section\|date=March 2010}}
	The empty string is a syntactically valid representation of [[0 (number)\|zero]] in [[positional notation]] (in any base), which does not contain [[leading zero]]s. Since the empty string does not have a standard visual representation outside of formal language theory, the number zero is traditionally represented by a single [[decimal digit]] '''0''' instead.		The empty string is a syntactically valid representation of [[0 (number)\|zero]] in [[positional notation]] (in any base), which does not contain [[leading zero]]s. Since the empty string does not have a standard visual representation outside of formal language theory, the number zero is traditionally represented by a single [[decimal digit]] '''0''' instead.

Ohnoitsjamie: per talk, agree that colon is non-standard usage and that comma is preferred

2025-01-26T01:36:17Z

per talk, agree that colon is non-standard usage and that comma is preferred

← Previous revision		Revision as of 01:36, 26 January 2025
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	==Use in programming languages==		==Use in programming languages==
	In most [[programming language]]s, strings are a [[data type]]. Strings are typically stored at distinct [[memory address]]es (locations). Thus, the same string (e.g.: the empty string) may be stored in two or more places in memory.		In most [[programming language]]s, strings are a [[data type]]. Strings are typically stored at distinct [[memory address]]es (locations). Thus, the same string (e.g., the empty string) may be stored in two or more places in memory.

	In this way, there could be multiple empty strings in memory, in contrast with the formal theory definition, for which there is only one possible empty string. However, a string comparison function would indicate that all of these empty strings are equal to each other.		In this way, there could be multiple empty strings in memory, in contrast with the formal theory definition, for which there is only one possible empty string. However, a string comparison function would indicate that all of these empty strings are equal to each other.

Ohnoitsjamie: no consensus to change this; e.g. is fine

2025-01-23T03:31:44Z

no consensus to change this; e.g. is fine

← Previous revision		Revision as of 03:31, 23 January 2025
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	==Use in programming languages==		==Use in programming languages==
	In most [[programming language]]s, strings are a [[data type]]. Strings are typically stored at distinct [[memory address]]es (locations). Thus, the same string (~~for example,~~ the empty string) may be stored in two or more places in memory.		In most [[programming language]]s, strings are a [[data type]]. Strings are typically stored at distinct [[memory address]]es (locations). Thus, the same string (e.g.: the empty string) may be stored in two or more places in memory.

	In this way, there could be multiple empty strings in memory, in contrast with the formal theory definition, for which there is only one possible empty string. However, a string comparison function would indicate that all of these empty strings are equal to each other.		In this way, there could be multiple empty strings in memory, in contrast with the formal theory definition, for which there is only one possible empty string. However, a string comparison function would indicate that all of these empty strings are equal to each other.

100.36.106.199: Undid revision 1270768018 by Logoshimpo (talk) per talk

2025-01-21T10:55:28Z

Undid revision 1270768018 by Logoshimpo (talk) per talk

← Previous revision		Revision as of 10:55, 21 January 2025
Line 21:		Line 21:

	==Use in programming languages==		==Use in programming languages==
	In most [[programming language]]s, strings are a [[data type]]. Strings are typically stored at distinct [[memory address]]es (locations). Thus, the same string (~~e.g.:~~ the empty string) may be stored in two or more places in memory.		In most [[programming language]]s, strings are a [[data type]]. Strings are typically stored at distinct [[memory address]]es (locations). Thus, the same string (for example, the empty string) may be stored in two or more places in memory.

	In this way, there could be multiple empty strings in memory, in contrast with the formal theory definition, for which there is only one possible empty string. However, a string comparison function would indicate that all of these empty strings are equal to each other.		In this way, there could be multiple empty strings in memory, in contrast with the formal theory definition, for which there is only one possible empty string. However, a string comparison function would indicate that all of these empty strings are equal to each other.

Logoshimpo: Undid revision 1270628538 by 100.36.106.199 (talk) gave links on talk page

2025-01-21T04:03:28Z

Undid revision 1270628538 by 100.36.106.199 (talk) gave links on talk page

← Previous revision		Revision as of 04:03, 21 January 2025
Line 21:		Line 21:

	==Use in programming languages==		==Use in programming languages==
	In most [[programming language]]s, strings are a [[data type]]. Strings are typically stored at distinct [[memory address]]es (locations). Thus, the same string (~~for example,~~ the empty string) may be stored in two or more places in memory.		In most [[programming language]]s, strings are a [[data type]]. Strings are typically stored at distinct [[memory address]]es (locations). Thus, the same string (e.g.: the empty string) may be stored in two or more places in memory.

	In this way, there could be multiple empty strings in memory, in contrast with the formal theory definition, for which there is only one possible empty string. However, a string comparison function would indicate that all of these empty strings are equal to each other.		In this way, there could be multiple empty strings in memory, in contrast with the formal theory definition, for which there is only one possible empty string. However, a string comparison function would indicate that all of these empty strings are equal to each other.