Name: constant

Type: command

Syntax: constant <constantsList>

Summary: Declares one or more labels to assign to <constant> <value|values>.

Introduced: 1.0

OS: mac,windows,linux,ios,android

Platforms: desktop,server,web,mobile

Example:

constant defaultName="Jones"

Example:

constant entryA="EF9993333WX786",entryB="GJ773281YX342"

Parameters:

constantsList (enum): The constantsList consists of one or more name=value pairs, separated by commas:

- The name is any string.

- The value is any literal string.

Description:

Use the <constant> <command> to assign an unchanging value to a <keyword>.

Constants can be numbers, characters, logical values, or strings.

A constant cannot be defined as an array, only as a single value.

>*Note:* Choose easy-to-understand names for <constant(glossary)|constants> to improve the readability of your code. Use <constant(glossary)|constants> as substitutes for long or convoluted <string|strings>.

If you place the <constant> <statement> in a <handler>, you can use the <constant(command)> anywhere in the <handler>. If you place the <constant> <statement> in a <script> outside any <handler>, you can use the <constant(command)> anywhere in the <handler|handlers> of that <script>.

Once you have defined a constant, you cannot redefine it in the same handler; doing so causes an execution error.

You can use the <constant> <command> to redefine <Revolution|LiveCode's> built-in <constant(glossary)|constants> within a <script> or <handler>, but doing so makes your code harder to read and maintain. To find out whether a word is already defined as a built-in <constant(command)>, use the <constantNames> <function>.

>*Tip:* To see a list of built-in constants, open the Documentation window, click LiveCode Dictionary, and choose "Constants" from the menu at the top of the window.

References: script (property), watch (constant), false (constant), slash (constant), comma (constant), plus (constant), null (constant), pi (constant), iBeam (constant), colon (constant), three (constant), formfeed (constant), help (constant), five (constant), zero (constant), seven (constant), eight (constant), CRLF (constant), quote (constant), empty (constant), space (constant), arrow (constant), six (constant), ten (constant), four (constant), two (constant), constant (command), local (command), constantNames (function), Revolution (glossary), value (glossary), handler (glossary), string (glossary), statement (glossary), constant (glossary), keyword (glossary), command (glossary), function (control_st)

Tags: properties