40 lines
1.1 KiB
Markdown
40 lines
1.1 KiB
Markdown
# Button Is Pressed
|
|
|
|
Check whether a button is pressed right now. The micro:bit has two buttons: button `A` and button `B`.
|
|
|
|
```sig
|
|
input.buttonIsPressed(Button.A);
|
|
```
|
|
|
|
### Parameters
|
|
|
|
* ``button`` is a [String](/reference/types/string). You should store `A` in it to check the left button, `B` to check the right button, or `A+B` to check both at the same time.
|
|
|
|
### Returns
|
|
|
|
* [Boolean](/blocks/logic/boolean) that is `true` if the button you are checking is pressed, `false` if it is not pressed.
|
|
|
|
### Example
|
|
|
|
This program uses an [if](/blocks/logic/if) to run
|
|
one part of the program if the `A` button is pressed, and
|
|
another part if it is not pressed.
|
|
|
|
```blocks
|
|
basic.forever(() => {
|
|
let pressed = input.buttonIsPressed(Button.A)
|
|
if (pressed) {
|
|
// this part runs if the A button is pressed
|
|
basic.showNumber(1, 150)
|
|
} else {
|
|
// this part runs if the A button is *not* pressed
|
|
basic.showNumber(0, 150)
|
|
}
|
|
})
|
|
```
|
|
|
|
### See also
|
|
|
|
[on button pressed](/reference/input/on-button-pressed), [if](/blocks/logic/if), [forever](/reference/basic/forever)
|
|
|