pxt-calliope/docs/js/call.md

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2016-06-28 19:35:31 +02:00
# Call a function
The simplest way to get started in JavaScript with your micro:bit is to
call one of the micro:bit's built-in JavaScript functions. Just like Blocks
are organized into categories/drawers, the micro:bit functions are organized by
namespaces. The `basic` namespace contains a number of very helpful
functions:
```typescript
basic.showString("Hello!")
```
If you want to see all functions available in a namespace, simply type `basic`
followed by `.`; a list of all the functions will appear.
![](/static/mb/js/basicFun.png)
Continue typing to select one of the functions, or click on one of the functions
to select. You also narrow down the set of functions by typing, as below:
![](/static/mb/js/basicIntell.png)
# Function parameters
You might have noticed that the call `showString` above takes one value,
the string to be scrolled on the LED screen. There is a second (optional)
parameter that controls the speed of the the scroll. Try this:
```typescript
basic.showString("Hello!",50)
```
You might have noticed that the function list above shows all
the available parameters for each function.
```typescript
basic.showString("Hello!")
basic.showLeds(`
. # . # .
. . . . .
. . # . .
# . . . #
. # # # .
`)
basic.pause(1000)
basic.clearScreen()
basic.showString("Goodbye!")
basic.showLeds(`
. # . # .
. . . . .
. . . . .
. # # # .
# . . . #
`)
basic.pause(1000)
basic.clearScreen()
```