Function toboolean(): Difference between revisions
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Converts variable to boolean (true or false) value (the only type usable in conditions). | Converts variable to boolean (true or false) value (the only type usable in conditions). | ||
<i>boolean</i> toboolean(< | <i>boolean</i> toboolean(<code>variable</code>) | ||
=== Parameters === | === Parameters === | ||
<i>mixed</i> < | * <i>mixed</i> <code>variable</code> will be converted to boolean value. | ||
=== Return value === | === Return value === | ||
Revision as of 18:56, 18 April 2017
Converts variable to boolean (true or false) value (the only type usable in conditions).
boolean toboolean(variable)
Parameters
- mixed
variablewill be converted to boolean value.
Return value
Falsy values are:
- number 0
- boolean false
- string ""
- table {}
Anything else converts to true.
Usage
local answer = 42
if toboolean(answer) then
log("42 is true!")
else
log("42 is false!")
end
To use inverse conversion (boolean to number) use 'x and 1 or 0' idiom:
local x = true
logf("x is %d", x and 1 or 0)
See also
Lua system's tonumber() and tostring() functions.