pxt-calliope/docs/reference/out-of-bounds.md

out of bounds

The behavior of functions whose parameter values are out of bounds.

Many of the @boardname@ functions have parameters. If a parameter is an unexpected value, the parameter is considered out of bounds.

For example, the plot function has two parameters:

syntax

led.plot(0,0)

parameters

• x - the x coordinate or horizontal position (0, 1, 2, 3, 4)
• y - the y coordinate or vertical position (0, 1, 2, 3, 4)

out of bounds

here's an example of code with an out of bounds parameter (the x and y parameters are outside the expected range of 0-4):

led.plot(9, -21)

what happens?

Typically, when a parameter supplied to a function is out of bounds that function does nothing (as if the function never executed). So, in the above case, the LED screen will not change.

return value

If you call the point function with an out of bounds parameter, the function returns false:

let on = led.point(5, -5)