Updating variables · Procedural

Build the idea

Start with the concept and its key vocabulary.

Key idea

Update a variable using its current value in a new assignment.

A variable can be assigned a new value. score = score + 1 reads the old score, adds one, then stores the result back in score. Sequence matters because each line sees the value left by the line before it.

Update

Assigning a new value to a variable that already exists.

Increment

Increasing a stored number, often by one.

Sequence

Instructions carried out in order from top to bottom.

Keep these in mind

The right side is calculated before the assignment happens.
score = score + 1 increases score by one.
Each update replaces the previous stored value.