Why space cannot exist in array element index?
Altair EmployeeHi all, how to understand the following error?
set city(Guang zhou) 'Guangdong'
wrong # args: should be 'set varName ?newValue?'
set city(Guang\ zhou) 'Guangdong'
Guangdong
Why space cannot exist in array element index?
Roy
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Altair EmployeeArray names (also variable name, proc name) must be one word
As tcl definition, string between 2 spaces is a word, or between 2 quotes or 2 braces
\ is a way to concate special characters to a word, so
Guang\ zhou
Is same as
'Guang zhou'
and same as
{Guang zhou}
is a word.
but
Guang zhou
are 2 words
Hi @tinh
I try to use 'Guang zhou' or {Guang zhou}, the same error. However when using Guang,zhou, it is ok. How to understand?
Roy
Maybe :
set 'city(Guang zhou)' GuangZhou
so 'city(Guang zhou)' is a variable name, it is one word
array names ok to have multiple words
Altair EmployeeMaybe :
set 'city(Guang zhou)' GuangZhou
so 'city(Guang zhou)' is a variable name, it is one word
array names ok to have multiple words 
Hi @tinh
I have tried your suggestion.
set 'city(Guang zhou)' 'Guangdong' it is ok.
How to understand why the previous statements were wrong?
Roy
Just understand as whatever you want.
If you can't, you don't need it to learn tcl, simply neglect all spaces.
Array names (also variable name, proc name) must be one word
As tcl definition, string between 2 spaces is a word, or between 2 quotes or 2 braces
\ is a way to concate special characters to a word, so
Guang\ zhou
Is same as
'Guang zhou'
and same as
{Guang zhou}
is a word.
but
Guang zhou
are 2 words