pxt-calliope/olddocs/js/guides/light-column-cascade-activity.md
2016-04-15 14:37:25 -07:00

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# Light Column Cascade Worksheet
My script. #docs
**Challenge 0**
Great Job! You have completed the Light Column Cascade tutorial having a nested for loop that plots each individual LED by column adding a delay between lighting each LED.
```
for (let i = 0; i < 5; i++) {
for (let j = 0; j < 5; j++) {
led.plot(i, j)
basic.pause(200)
}
}
```
**Challenge 1**
Make the board light up faster by making the pause less time.
```
for (let i1 = 0; i1 < 5; i1++) {
for (let j1 = 0; j1 < 5; j1++) {
led1.plot(i1, j1)
basic1.pause(100) // ***
}
}
```
**Challenge 2**
Make the board light up by rows instead of by columns by changing the i to the y position and j to the x position.
```
for (let i2 = 0; i2 < 5; i2++) {
for (let j2 = 0; j2 < 5; j2++) {
led2.plot(j2, i2) // ***
basic2.pause(100)
}
}
```