Variables — var in loop closures (the classic gotcha)

var in loops: all closures share the same binding

When you create closures inside a for loop with var, all closures share one binding. By the time they run, i is already at its final value.

Challenge: Write varLoopClosure() that:

1. Creates an array fns
2. Uses a for (var i = 0; i < 3; i++) loop and pushes () => i to fns
3. Returns fns[0]() — this returns the final value of i (3), not 0