# All files roundmath.js

83.33% Statements 15/18
100% Branches 2/2
50% Functions 3/6
100% Lines 13/13

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     /*       */
    "use strict";

    // These won't be exported:

    const roundToCents = (x        )         => Math.round(x * 100) / 100;

    const changeSign = (x        )         => -x;

    // The following will be exported:

    const addR = (x        , y        )         => roundToCents(x + y);

    const subR = (x        , y        )         => addR(x, changeSign(y));

    const multR = (x        , y        )         => roundToCents(x * y);

    const divR = (x        , y        )         => {
        if (y === 0) {
            throw new Error("Divisor must be nonzero");
        } else {
            return roundToCents(x / y);
        }
    };

    /*
        NOTES:
        1. Exports are all together, at the end, per convention
        2. roundToCents and changeSign are not exported, on purpose
    */
    exports.addR = addR;
    exports.subR = subR;
    exports.multR = multR;
    exports.divR = divR;