# Modify-in-place

Let n = 2;
n += 5; // now n = 7 (same as n = n + 5)
n *= 2; // now n = 14 (same as n = n * 2)

alert( n ); // 14

We often need to apply an operator to a variable and store the new result in it.

Modify-in-place

## Modify-in-place — Structure map

Clickable & Draggable!