# Pass variables to closure ## Description By default, closures capture their environment by borrowing. Or you can use `move`-closure to move whole environment. However, often you want to move just some variables to closure, give it copy of some data, pass it by reference, or perform some other transformation. Use variable rebinding in separate scope for that. ## Example Use ```rust let num1 = Rc::new(1); let num2 = Rc::new(2); let num3 = Rc::new(3); let closure = { // `num1` is moved let num2 = num2.clone(); // `num2` is cloned let num3 = num3.as_ref(); // `num3` is borrowed move || { *num1 + *num2 + *num3; } }; ``` instead of ```rust let num1 = Rc::new(1); let num2 = Rc::new(2); let num3 = Rc::new(3); let num2_cloned = num2.clone(); let num3_borrowed = num3.as_ref(); let closure = move || { *num1 + *num2_cloned + *num3_borrowed; }; ``` ## Advantages Copied data are grouped together with closure definition, so their purpose is more clear and they will be dropped immediately even if they are not consumed by closure. Closure uses same variable names as surrounding code whether data are copied or moved. ## Disadvantages Additional indentation of closure body.