Reference: isa
Author: Ellen Siever, Stephen Spainhour & Nathan Patwardhan
Date: 1999-07-02T01:55:12Z

#

| Chapter 8 Standard Modules |

## isa

    $io = $fd->isa(type)

Returns true if the reference is blessed into package type or inherits from that package. Can be called as a static or object method call, or as a subroutine:

>     UNIVERSAL::isa(val, type)

Returns true if the first argument is a reference and either of the following is true:

- `val` is a blessed reference and is blessed into package `type` or inherits from package `type`

- `val` is a reference to a `type` of Perl variable (e.g., '`HASH`')

Reference: can |  | Reference: VERSION