Method addScalar

docs/app/js/sanddance-app.js:69356–69359

(a)

        return this.check();
    }
    addScalar(a) {
        for(let i = 0; i < this.ELEMENTS; ++i)this[i] += a;
        return this.check();
    }
    subScalar(a) {
        return this.addScalar(-a);
    }