pxt-calliope/docs/reference/logic/if.md
2016-06-11 22:28:57 -04:00

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# If
### @parent blocks/language
Conditionally run code depending on whether a [Boolean](/reference/types/boolean) condition is true or false.
```blocks
if(true) {
}
```
In the Block Editor, click on the dark blue gear icon (see above) to add an *else* or *if* to the current block.
### Example: adjusting screen brightness
```blocks
if(input.lightLevel()<100){
led.setBrightness(255);
}
```
If the [light level](/input/light-level) is `< 100`, this code sets the brightness to `255`:
### See also
[while loop](/reference/loops/while), [for](/reference/loops/for), [boolean](/reference/types/boolean)