How can a variable be created?

All strings in the source code that are different from the keywords of the language itself are interpreted as names. For example whereIam or I_AM_HERE are just names in the first instance. Only an assignment transforms a simple name into a variable. whereIam = “I am here“ is creating a variable whereIam of a data type string.

See also...

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In the configuration tool SYCON.net exists the possibility to define variables outside the script, how can I access to those variables in my script?
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How are variables internally managed?
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Is a chained if-elseif conditional check proceeding all checks always independent if one check is true?
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How is a "local" variable distinguished from a "global" variable?
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How can a variable be created?
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Do variables need a data type?
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If variables are defined in SYCON.net and the netSCRIPT debugger is used afterwards are these variables still accessible?
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Is netSCRIPT respective Lua case-sensitive when a variable is defined?
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How can I undefine a variable and free resources?