Pass in string then concatenate array name in lua

[Jax]

I wanted to make it so that I can get the array by passing a number in a function.

Bang: [!CommandMeasure Lua "loadArray(1)"]

Lua:

Code: Select all

1Array = {0}

loadArray(num)
	print(num..Array[0])
end

[balala]

I wanted to make it so that I can get the array by passing a number in a function.

Bang: [!CommandMeasure Lua "loadArray(1)"]

Lua:

Code: Select all

1Array = {0}

loadArray(num)
	print(num..Array[0])
end

In lua the indices of arrays by default are starting from 1, not from 0. So the above print function should be print(num..Array[1]), in order to get concatenated the num variable with the first element of the Array array.
Note that there seems to be a typo in the above code. I suppose the array should be Array = {0} (not 1Array = {0}). If I'm not mistaken the name of an array can't start with a number in lua.

[Jax]

If I'm not mistaken the name of an array can't start with a number in lua.

I see...

but how can I solve my problem? supposed I have 2 arrays, array1 and array2, when I run [!CommandMeasure Lua "loadArray(1)"] I want to make it print out the 1st value of array1.

[death.crafter]

I see...

but how can I solve my problem? supposed I have 2 arrays, array1 and array2, when I run [!CommandMeasure Lua "loadArray(1)"] I want to make it print out the 1st value of array1.

You can't... It's a variable so it should be accessed by name only.

And also you can't start a variable name from 1. Well, if lua follows usual programming rules.

But you can do:

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local mainArray={}
mainArray["subArray1"]={'cat', 'dog'}
mainArray["subArray2"]={'crow', 'pigeon'}

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!CommandMeasure Lua "print(mainArray['subArray'..'#NumberVariable#'][1])"

Or make it a function. Whatever you prefer.

[Jax]

Cool, thanks

[jsmorley]

A simple example of obtaining a value from a Lua table (array) by the implied index number:

Skin:

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[Rainmeter]
Update=1000
DynamicWindowSize=1
AccurateText=1

[Variables]

[MeasureLoop]
Measure=Loop
StartValue=1
EndValue=4

[Lua]
Measure=Script
ScriptFile=Test.lua
Disabled=1

[MeterOutput]
Meter=String
FontSize=11
FontWeight=400
FontColor=255,255,255,255
SolidColor=47,47,47,255
Padding=5,5,5,5
AntiAlias=1
Text=[&Lua:Lookup([&MeasureLoop:])]
DynamicVariables=1

Test.lua:

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function Initialize()

	tableLookup = {'one banana','two banana','three banana', 'four'}

end

function Lookup(indexArg)
	
	return tableLookup[indexArg]
		
end

Table indexes in Lua start with "1", not "0". Keep this in mind if you are used to zero-based arrays in other languages.

Also keep in mind that you cannot directly access the indexed value of a table in Lua from Rainmeter

Text=[&Lua:tableLookup[[&MeasureLoop:]] won't work with tables like it would with just a "variable" set in Lua. You have to pass the index number you want, and return that using a Lua call to the table values.

Animation.gif

You can add more functionality to react to "mistakes" as well:

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function Initialize()

	tableLookup = {'one banana','two banana','three banana', 'four'}

end

function Lookup(indexArg)
	
	if indexArg > #tableLookup or indexArg < 1 then
		return 'Out of range!'
	else
		return tableLookup[indexArg]
	end

end

[Yincognito]

By the way, if you want to print the whole array, you can use the unpack() function in Lua:

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print(unpack{10,20,30})