Vue.js explained through Pokemon #5

Damage-calculateCritical.js

    calculateCritical(otherPokemonType) {
        const random = Math.floor(Math.random() * 255);
        const probability = (this.attack.type == 'normal') ? this.attacking.stats.speed / 512 : this.attacking.stats.speed / 256;

        // Seems like we've got a critical hit
        if (random < probability) {
            Vuemit.fire(otherPokemonType+'.attack.effective', 'Critical hit!');
            // Lower leveled pokemon will have a smaller percentage of bonus
            return ((this.attacking.stats.level * 2) + 5) / (this.attacking.stats.level + 5);
        }

        // Normal attack power
        return 1;
    }