Function Repository Resource:

EmptyQ

Source Notebook

Test whether a structure can be considered empty

Contributed by: Bob Sandheinrich

ResourceFunction["EmptyQ"][expr]

gives True if expr is an empty structure and False otherwise.

Details and Options

Recognized structures include List, String, Association, Dataset, Graph, SparseArray, File, CloudObject, Graphics and Databin.

A structure must exist to be considered empty.

A File object is considered empty if it is an empty file or an empty directory.

Examples

Basic Examples (3)

Check if a list is empty:

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Check if an association is empty:

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If any values exist, it is not empty:

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Scope (7)

Any characters, including whitespace, make a string not empty:

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$ResourceFunction["EmptyQ"] /@ {"", "a", " ", "\n"}$

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A graph with no vertices is empty:

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An empty sparse array:

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New databins are empty:

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Use File to check if files or directories are empty:

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Check if a CloudObject is empty:

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Graphics can be empty:

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Properties and Relations (1)

Files and cloud objects must exist to be considered empty:

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Requirements

Wolfram Language 11.3 (March 2018) or above

Version History

1.0.0 – 11 October 2018

License Information

This work is licensed under a Creative Commons Attribution 4.0 International License