for i in 1 ... num{ code()

}

if condition { code() }

&&, ||, !

after saving an information type, you can never change it (e.g., var a = 3 a = 'a' -> can not do)

var gemCounter = while !isOnGem{ moveForward() if isOnGem{ collectGem() gemCounter+=1 } if gemCounter==1{ break } }

=== var gemCounter=0 var blockCounter = 0 while !isOnGem{ blockCounter=0 moveForward() if isOnGem{ collectGem() gemCounter+=1 } while isBlocked{ turnRight() blockCounter+=1 } if blockCounter==2{ break } }

var gem_num=0 bluePortal.isActive=false pinkPortal.isActive=false while gem_num<4{ moveForward() if isOnGem{ collectGem() turnLeft() turnLeft() gem_num+=1 } if gem_num==1{ pinkPortal.isActive=true bluePortal.isActive=true } if gem_num==3{ bluePortal.isActive=false } if isBlocked{ turnLeft() turnLeft() }

}

==== let expert = Expert() var gem_num=0 while gem_num<3{ for i in 1 ... 3{ expert.moveForward() } if expert.isOnGem{ expert.collectGem() gem_num+=1 expert.turnRight() expert.turnRight() } else if expert.isBlocked{ expert.turnLockUp() expert.turnRight() expert.turnRight() } else if !expert.isBlocked{ expert.turnRight()

}

}

===== func moveAndCollect() { moveForward() collectGem() }

func moveAndToggle() { moveForward() toggleSwitch() }

func move() { var gem_num = 0 while gem_num < 4 { moveAndCollect() gem_num += 1

    moveAndToggle()
    moveForward()
    turnLeft()

    moveAndCollect()
    gem_num += 1

    moveAndToggle()
    moveForward()
    moveForward()
    turnLeft()
}

}

move()

==== let expert = Expert() world.place(expert, atColumn: 2, row: 6) var gem_num=0 while gem_num<3{ if gem_num==3{ break } if expert.isBlockedLeft{ expert.turnLeft() expert.turnLockUp() expert.turnRight() expert.turnRight() expert.moveForward() if expert.isOnGem{ expert.collectGem() gem_num+=1 } expert.turnLeft() expert.turnLeft() expert.moveForward() expert.turnRight() expert.moveForward() expert.moveForward() expert.moveForward() expert.moveForward() expert.moveForward() } if expert.isOnGem{ expert.collectGem() gem_num+=1 }

}