Iterating over an array batch script

Question

While following a tutorial for iterating over arrays in a batch script I didn't get the same result:

@echo off 
setlocal enabledelayedexpansion 
set topic[0] = comments 
set topic[1] = variables 
set topic[2] = Arrays 
set topic[3] = Decision making 
set topic[4] = Time and date 
set topic[5] = Operators 

for /l %%n in (0,1,5) do ( 
   echo !topic[%%n]! 
)

When I run this command I get:

This means that the people that wrote such a tutorial didn't tested its own code! :( I suggest you to read this answer about array management in Batch files... — Aacini
– Aacini, Commented Jun 5, 2017 at 18:23
@Aacini Yes - I agree. I sent them an email. The sad part is it's a very prominent website. The whole tutorial series is like this and it's like 24 chapters. — Adrian Elder
– Adrian Elder, Commented Jun 5, 2017 at 18:24

Nahuel Fouilleul · Accepted Answer · 2017-06-05 14:46:53Z

6

in batch spaces matter because it's an argument delimiter

set topic[0] = comments

should be

set topic[0]=comments

Something strange with cmd is that variables can terminate with a space

set topic[0] = comments
echo %topic[0] %
 comments

edited Jun 5, 2017 at 14:46

answered Jun 5, 2017 at 14:43

Nahuel Fouilleul

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1 Comment

Adrian Elder Over a year ago

This fixed my issue. Thanks!

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