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isnan​

isnan(
    @x ## anything (required)
) -> int

Checks if the input argument is strictly a nan—i.e., 'not a number'—value.

Arguments​

  • @x [anything]: Value to check (required)

Output​

0 if false, 1 if true. [int]

Usage​

$nan = log(-1);
print($nan);
print(
    if isnan($nan) then 'yes' else 'no', 'is not a number?'
)