{:defined; ... :}
=================
Output code if a variable is defined
```html
{:defined; variable >> code :}
{:defined; varname >> this shown if varname is defined :}
```
Modifiers:
----------
```html
{:^defined; ... :}
{:!defined; ... :}
{:+defined; ... :}
```
For more details about the "+" modifier see "modifiers".
### Modifier: ! (not)
```html
{:!defined; varname >> this shown if varname is not defined :}
```
No flags
--------
Examples
--------
```html
{:defined; true >> Shown! :}
{:defined; false >> Shown! :}
{:defined; hello >> Shown! :}
{:defined; zero >> Shown! :}
{:defined; one >> Shown! :}
{:defined; spaces >> Shown! :}
{:defined; empty >> Shown! :}
{:defined; null >> Not shown :}
{:defined; undef >> Not shown :}
{:defined; undefarr >> Not shown :}
{:defined; emptyarr >> Shown! :}
{:defined; array >> Shown! :}
{:defined; array->true >> Shown! :}
{:defined; array->false >> Shown! :}
{:defined; array->hello >> Shown! :}
{:defined; array->zero >> Shown! :}
{:defined; array->one >> Shown! :}
{:defined; array->spaces >> Shown! :}
{:defined; array->empty >> Shown! :}
{:defined; array->null >> Not shown :}
{:defined; array->undef >> Not shown :}
```
Assumes data:
```json
{
"data": {
"true": true,
"false": false,
"hello": "hello",
"zero": "0",
"one": "1",
"spaces": " ",
"empty": "",
"null": null,
"emptyarr": [],
"array": {
"true": true,
"false": false,
"hello": "hello",
"zero": "0",
"one": "1",
"spaces": " ",
"empty": "",
"null": null
}
}
}
```
---
