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The steering wheel

Abstraction

The analogy

You steer a car with a wheel. You never think about the rack, the pinion or the hydraulics — the wheel hides all of it and gives you one simple thing to turn. Good abstraction leaves you only the controls you actually need.

Visualizer

Peeling back the steering wheel

step 1 / 7
ABSTRACTION LAYERS
Steering wheel — the only thing you touch
Steering column
Rack and pinion
Hydraulic assist
Tyre against road

You turn the wheel. As far as you are concerned, that is the whole mechanism.

def steer(angle):
    _column_rotate(angle)      # you never call these

def _column_rotate(a):
    _rack_translate(a * 0.6)

def _rack_translate(mm):
    _hydraulics_assist(mm)

steer(-15)   # the only line you write
Check yourself

Abstraction mainly reduces…