pxt-calliope/docs/reference.md

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# Reference
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## micro:bit
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```namespaces
basic.showString("Hello!");
input.onButtonPressed(Button.A, () => {});
led.plot(0,0);
radio.sendNumber(0);
music.playTone(music.noteFrequency(Note.C), music.beat(BeatFraction.Whole));
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game.createSprite(2,2);
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pins.digitalReadPin(DigitalPin.P0);
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serial.writeLine("Hello!");
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control.inBackground(() => {});
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```
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## Language
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### @section full
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### ~column
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### Loops
[for](/microbit/reference/loops/for)
```block
for(let i = 0;i<5;i++) {}
```
[repeat](/microbit/reference/loops/repeat)
![](/static/mb/blocks/contents-0.png)
[while](/microbit/reference/loops/while)
```block
while(true) {}
```
[forever](/microbit/reference/basic/forever)
```block
basic.forever(() => {})
```
### ~
### ~column
### Logic
[if](/microbit/reference/logic/if)
```block
if(false) {
}
```
[Boolean](/microbit/reference/types/boolean) values: *true*; *false*
```block
true
false
```
Boolean binary operators: *and* (conjunction); *or* (disjunction)
```block
true && false;
true || false;
```
Boolean negation operator
```block
!true
```
Comparison operators (=, !=, <, >, <=, >=)
```block
0 == 0;
1 !- 0;
0 < 1;
1 > 0;
0 <= 1;
1 >= 0;
```
### Variables
[Assign](/microbit/reference/variables/assign) (set) a variable's value
```block
let x = 0;
```
Get a variable's value
```block
let x = 0;
x;
```
[Change](/microbit/reference/variables/change-var) a variable's value
```block
let x = 0;
x+=1;
```
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### ~
### ~column
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### Math
[Numeric](/microbit/reference/types/number) values: 0, 1, 2, ...
```block
0;
1;
2;
```
Arithmetic binary operation (+, -, *, /)
```block
0+1;
0-1;
1*2;
3/4;
```
Absolute value
```block
Math.abs(-5);
```
Minimum/maximum of two values
```block
Math.min(0, 1);
Math.max(0, 1);
```
Random value
```block
Math.random(5);
```
### Comments
[comment](/microbit/reference/comment)
### ~