is_err

This function determines whether the provided value is a error or not.

This function does not generate an event.

Function

is_err(value)

Arguments

Return value

Returns true if the given value is an error, else it returns false.

Example

This code shows some return values for is_err():

[
    is_err( err() ),
    is_err( zero_div_err() ),
    is_err( try((1 / 0)) ),
    is_err( try((1 / 1)) ),
];

Return value in JSON format

[
    true,
    true,
    true,
    false
]