In this project, one helpful thing I noticed was that all of the gems and portals were in the same pattern. What I did was make a function and a for loop to match this pattern:

func gem() {

    for i in 1 … 2 {

        moveForward()

        collectGem()

    }

    turnLeft()

    turnLeft()

    moveForward()

    turnRight()

    moveForward()

    collectGem()

    turnLeft()

    turnLeft()

    moveForward()

    moveForward()

    collectGem()

}

for i in 1 … 4 {

    gem()

    moveForward()

}