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Chainable Calculator

EasyP2Coding

Implement calculator(initial = 0), which returns a chainable calculator object with these methods:

  • add(n), subtract(n), multiply(n): apply the operation to the running total and return the same calculator, so calls chain.
  • value(): return the current total.

The calculator starts at initial (default 0). Each calculator keeps its own total. Reading value() does not change the total.

Example 1

Input
calculator(2).add(3).multiply(4).subtract(1).value()
Output
19
Why
((2 + 3) * 4) - 1

Constraints

  • All numbers are finite.
  • At most 10^4 chained calls.

Hints

Run checks the 3 visible tests, Submit all 7.