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ldq

const quarterOf = (month) => {
  return Math.floor(((month + 11) / 3) % 4) + 1;
};

Strategy

Ldq approached this problem mathematically. Rather than selecting from a list of possible answers, they created a formula to calculate the correct value from the argument.

Implementation

Math.floor(number): This function rounds a floating point number down to the nearest integer

parenthesis: As the normal order of operations would not work, ldq used parenthesis to group the mathematical operators differently.

+, /, %, +: these operators combine the argument with hard-coded values to calculate the correct solution.

Possible Refactors

This strategy could also be implemented using these (but not only these) Implementation ...

  • an arrow function with implicit return
  • bitwise operators (if you want to make your life difficult)
  • Math.ceil to round up, instead of rounding down

References

For ldq's solution I needed to review operator precedence and look up how Math.floor works.