# Reference

```namespaces
basic.showString("Hello!");
input.onButtonPressed(Button.A, () => {});
for (let i = 0;i<5;++i) {}
if (true){}
let x = 0;
Math.random(5);
led.plot(0,0);
radio.sendNumber(0);
music.playTone(music.noteFrequency(Note.C), music.beat(BeatFraction.Whole));
game.createSprite(2,2);
pins.digitalReadPin(DigitalPin.P0);
serial.writeLine("Hello!");
control.inBackground(() => {});
```
