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34 lines
588 B
Markdown
34 lines
588 B
Markdown
---
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title: empty?
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layout: command
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version: 0.59.0
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---
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Check for empty values.
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## Signature
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```> empty? ...rest --block```
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## Parameters
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- `...rest`: the names of the columns to check emptiness
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- `--block {block}`: an optional block to replace if empty
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## Examples
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Check if a value is empty
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```shell
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> '' | empty?
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```
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more than one column
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```shell
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> [[meal size]; [arepa small] [taco '']] | empty? meal size
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```
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use a block if setting the empty cell contents is wanted
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```shell
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> [[2020/04/16 2020/07/10 2020/11/16]; ['' [27] [37]]] | empty? 2020/04/16 -b { |_| [33 37] }
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```
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