42 lines
1.2 KiB
Markdown
42 lines
1.2 KiB
Markdown
# Call a function
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The simplest way to get started in JavaScript with your micro:bit is to
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call one of the micro:bit's built-in JavaScript functions. Just like Blocks
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are organized into categories/drawers, the micro:bit functions are organized by
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namespaces. The `basic` namespace contains a number of very helpful
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functions:
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```typescript
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basic.showString("Hello!")
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```
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If you want to see all functions available in a namespace, simply type `basic`
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followed by `.`; a list of all the functions will appear.
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Continue typing to select one of the functions, or click on one of the functions
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to select. You also narrow down the set of functions by typing, as below:
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# Function parameters
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You might have noticed that the call `showString` above takes one value,
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the string to be scrolled on the LED screen. There is a second (optional)
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parameter that controls the speed of the scroll. Try this:
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```typescript
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basic.showString("Hello!",50)
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```
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If you don't give a value for an optional parameter, where does its value
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come from? TBD.
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You might have noticed that the function list above shows all
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the available parameters for each function.
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### ~button /js/sequence
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NEXT: Sequencing Commands
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### ~
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