let 2.1

let variable value

Creates a new local variable and gives it the given value. A local variable is one that exists only within the enclosing block of commands.

If you want to change the value afterwards, use set.

Example:

let prey one-of sheep-here
if prey != nobody
  [ ask prey [ die ] ]

You can also create multiple local variables if you put the variable names in a list format. The values for the new variables will be taken from the list given as the second argument. This can be particular useful when you want to calculate multiple values in a reporter procedure, as you can easily create multiple variables with the results. A runtime error will occur if you do not give a list of values or the list you provide doesn’t have enough values for all the variables.

let [x y z] [10 15 20]
show x ; prints 10
show y ; prints 15
show z ; prints 20

let [a b c] [10] ; causes a runtime error as we need at least 3 values in the list