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Returns a bool from a specified value.
If no value is given, false
is returned.
Types with a length evaluate to true
when the length is not 0
, and false
otherwise.
This function does not generate an event.
bool(value)
Argument | Type | Description |
---|---|---|
value | any (optional) | The value to convert to a boolean value. |
A boolean value.
This code shows some return values for bool():
[
{ bool(); /* default bool is false */},
{ bool(0); /* zero (0) evaluates to false */},
{ bool(0.0); /* zero float (0.0) evaluates to false */},
{ bool(nil); /* nil evaluates to false */},
{ bool({}); /* an empty thing evaluates to false */},
{ bool(err()); /* any error evaluates to false */},
{ bool(''); /* an empty string evaluates to false */},
{ bool([]); /* an empty array evaluates to false */},
{ bool(42); /* non zero integers evaluates to true */},
{ bool(-1.0); /* non zero float values evaluates to true */},
{ bool({answer: 42}); /* non empty thing evaluates to true */},
{ bool([1, 2, 3]); /* non empty array evaluates to true */},
{ bool('forty two'); /* non empty string evaluates to true */},
];
Return value in JSON format
[
false,
false,
false,
false,
false,
false,
false,
false,
true,
true,
true,
true,
true
]