is_error

Function

  is_error — test if a value is an error

Synopsis

is_error(val: any) -> bool

Description

The is_error function returns true if its argument’s type is error. is_error(v) is shortcut for kind(v)=="error",

Examples

A simple value is not an error:

yield is_error(this)

true

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An error value is an error:

yield is_error(this)

true

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Convert an error string into a record with an indicator and a message:

yield {err:is_error(this),message:under(this)}

"not
an
error"
error("an
error")

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