pxt-calliope/docs/reference/js/lessons/smiley/quiz-answers.md

smiley quiz answers.

This is the answer key for the smiley quiz.

1. Define 'show animation' :

A function that will show a series of image frames on the LED screen, pausing the specified time after each frame.

2. Why is there an extra empty frame after the smiley face?

basic.showAnimation(`
. # . # . . . . . .
. # . # . . . . . .
. . # . . . . . . .
# . . . # . . . . .
. # # # . . . . . .
`, 400)

The extra empty frame creates a blinking smiley, allowing the BBC micro:bit to alternate between showing the smiley and the empty screen.

3. Change the delay shown from 400 milliseconds to 1000 milliseconds.

basic.showAnimation(`
. # . # . . . . . .
. # . # . . . . . .
. . # . . . . . . .
# . . . # . . . . .
. # # # . . . . . .
`, 400)

basic.showAnimation(`
. # . # . . . . . .
. # . # . . . . . .
. . # . . . . . . .
# . . . # . . . . .
. # # # . . . . . .
`, 1000)

4. Now let's change the delay shown below from 400 milliseconds to 2.5 seconds.

basic.showAnimation(`
. # . # . . . . . .
. # . # . . . . . .
. . # . . . . . . .
# . . . # . . . . .
. # # # . . . . . .
`, 400)

basic.showAnimation(`
. # . # . . . . . .
. # . # . . . . . .
. . # . . . . . . .
# . . . # . . . . .
. # # # . . . . . .
`, 2500)