browsers through WebAssembly

class Discount {
    constructor(rate){
        this.rate=rate;
    }
    apply (v) {
        return v * (1 - this.rate);
    }
}

const regularDiscount = new Discount(0.1);
const premiumDiscount = new Discount(0.2);

console.log(regularDiscount.apply(100));
console.log(premiumDiscount.apply(100));
console.log(regularDiscount.apply(200));

    public boolean isPalindrome(int x) {
        String s = "" + x;
        int l = s.length();
        for(int i = 0;i < l;i++){
            int j = l-1-i;
            if (s.charAt(i)!=s.charAt(j)) return false;
        }
        return true;
    }

    private int reverse(int n){
        int r = 0;
        while(n != 0) {
            int d = n % 10;        
            r = r * 10 + d;
            n = n / 10;
        }
        return r;
    }

     public boolean isPalindrome(int x) {
        if(x<0)return false;
        return reverse(x)==x;
    }