While And Until
While
The
while
statement repeats a block of code while a condition is true.
Example
while boolean (
command
command
)
Syntax
while condition (
commands
)
condition
: The condition that determines whether to continue executing the block of commands.commands
: The commands to be executed within the loop.
Example
while distance_to_object < 10 (
robot "moveForward" 10
robot "turnLeft" 10
robot "get_data"
distance_to_object = robot."sensor1"
)
In this example, the robot will keep moving forward and turning left as long as there is an obstacle ahead.
Until
The
until
statement repeats a block of code until a condition is true.
Example
until boolean (
command
command
)
Syntax
until condition (
commands
)
condition
: The condition that determines whether to stop executing the block of commands.commands
: The commands to be executed within the loop.
Example
until isGoalReached (
// do things to get to goal
)
In this example, the robot will keep moving forward until the goal is reached.
Use Cases
User Input Validation with
while
// Ask for user input until a valid value is entered
userInput = null
while userInput != null (
userInput = "hello".ask()
// keep asking until the user answers
)
This example demonstrates how the while
statement can be used to repeatedly prompt the user for input until a valid value is entered.
Waiting for External Event with
until
// Wait until a sensor detects an object
objectDetected = false
until objectDetected (
robot "get_data"
objectDetected = robot.detected
)
Here, the until
statement is used to wait until a sensor detects an object before proceeding with the next set of commands.
Last updated
Was this helpful?