Calculator
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``Arokettu\ArithmeticParser\Calculator`` class is used to interpret the arithmetic expression.

``Arokettu\ArithmeticParser\LazyCalculator`` class also supports lazy expressions, see :ref:`lazy-calc`.

``Calculator::parse()`` / ``LazyCalculator::parse()``
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Parses the expression and creates an instance of calculator for it.

``calc()``
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Evaluates the expression with given variables (if any).

``Calculator::evaluate()`` / ``LazyCalculator::evaluate()``
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``Calculator::evaluate($expression, $config, ...$vars)`` is a shorthand for
``Calculator::parse($expression, $config)->calc(...$vars)``