pxt-calliope/docs/js/call.md

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:

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.

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:

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:

basic.showString("Hello!",50)

You might have noticed that the function list above shows all the available parameters for each function.

basic.showString("Hello!")
basic.showLeds(`
    . # . # .
    . . . . .
    . . # . .
    # . . . #
    . # # # .
    `)
basic.pause(1000)
basic.clearScreen()
basic.showString("Goodbye!")
basic.showLeds(`
    . # . # .
    . . . . .
    . . . . .
    . # # # .
    # . . . #
    `)
basic.pause(1000)
basic.clearScreen()