Rotate LED

let index = 0
basic.forever(function () {
    index = 0
    while (index <= 4) {
        led.plot(index, 0)
        index += 1
        basic.pause(100)
    }
    index = 0
    while (index <= 4) {
        led.plot(4, index)
        index += 1
        basic.pause(100)
    }
    index = 4
    while (index > 0) {
        led.plot(index, 4)
        index += -1
        basic.pause(100)
    }
    index = 4
    while (index > 0) {
        led.plot(0, index)
        index += -1
        basic.pause(100)
    }
    index = 0
    while (index <= 4) {
        led.unplot(index, 0)
        index += 1
        basic.pause(100)
    }
    index = 0
    while (index <= 4) {
        led.unplot(4, index)
        index += 1
        basic.pause(100)
    }
    index = 4
    while (index > 0) {
        led.unplot(index, 4)
        index += -1
        basic.pause(100)
    }
    index = 4
    while (index > 0) {
        led.unplot(0, index)
        index += -1
        basic.pause(100)
    }
})