$false

$false The boolean false constant
Usage
<boolean> $false
Description
Evaluates to the false boolean constant. False is equivalent to the integer 0 too. This function/constant is useful to keep your code readable: when you have a variable that can assume boolean values it's nicer to use $true and $false instead of the integer constants 1 and 0. The reader will understand immediately that the variable simply can't assume any other value.
Examples
%a = $false echo $typeof(%a) echo $(%a + 1)
See also
$true

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