Formula (Extended): $ISTEXT Function
## Overview
Return true if the argument is a string.
## Syntax
```
$ISTEXT(string)
```
## Parameters
|Parameter|Type|Required|Description|
|:---|:---|:---|:---|
|String|Arbitrary String|Required||
### Column Usable as Parameters
|Parameter|Classification|Numerical Value|Date|Description|Check|
|:---|:---|:---|:---|:---|:---|
|String|Yes*1|Yes*2|Yes*2|Yes*1|Yes*2|
*1: Determined as follows based on input value
|Input value|Result|
|:---|:---|
|Blank|false|
|Half-width numerical value only|false|
|Full-width numerical value|true|
|Other strings|true|
*2: Always false
## Return Value
True if string. Otherwise, false.
### Return Value for Target Column
|Target|Return Value|
|:---|:---|
|Classification (including title, status, manager, owner)|Display the string "True" or "False"|
|Numerical Value (including work volume, progression rate, remaining work volume)|Do not display|
|Date (including start and completion)|Do not display|
|Description (including content)|Display the string "True" or "False"|
|Check (including lock)|Check ON if true, check OFF if false|
## Usage Example ①
Specify parameters by screen column name (name displayed)
### Formula
![image](https://pleasanter.org/binaries/bcd4ffa26d5a4936959a4f8becaf2617)
### Parameters
![image](https://pleasanter.org/binaries/96ce3abb5ff34057ac9951285e2582e9)
### Calculation Result
![image](https://pleasanter.org/binaries/367d221b44da465188bbedbab2bfcf17)