Tradescript for donchian channel

Could someone please provide me with an example coding using donchian channel .

hElLO tRaDeR,

Based on the Donchain Formula of:

Upper Channel = 20 Day High
Lower Channel = 20 Day Low
Middle Channel = (20 Day High + 20 Day Low)/2

TRADESCRIPT:

Upper Channel = HHV(20)
Lower Channel = LLV(20)
Middle Channel = (HHV(20) + LLV(20)) / 2

What if i am trying to find the difference between the donchian channel bottom and bollinger bands bottom. Is there any way to code such conditions?

ABS(LLV(20) - BBB(CLOSE, 20, 2, EXPONENTIAL))

what does the ABS stand for and what is the for LLV ?

The ABS function returns the absolute value for a number. Negative numbers
become positive and positive numbers remain positive.