How to convert string to boolean in lua

user_8713243 0
Viewed 5305

I have data received from another script where the variable has the value "false" or "true". I want to convert this value to true or false in lua datatype. Currently, I can do this long way:

if value == "false" then
  value=false
elseif value == "true" then
  value=true
end

Is there a simplest way to convert this like converting string to integer tonumber("1")

lua
4 Answers

You can also do this:

stringtoboolean={ ["true"]=true, ["false"]=false }
print(stringtoboolean[s])
user_1070900

Since I frequently do the conversion for each data received, manually converting the string to boolean like I posted above will make the code redundant. So I create a function to overcome this:

function toboolean(str)
    local bool = false
    if str == "true" then
        bool = true
    end
    return bool
end

So I can do this

toboolean("true")

and anything other than the "true" string will become false

user_87132430

No, because "false" will also evaluate to true, so if you want "false" to evaluate to false, you will have to convert it manually.

user_134213060

Case independent way:

function str_to_bool(str)
    if str == nil then
        return false
    end
    return string.lower(str) == 'true'
end
user_61464420
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