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export class CustomFunction {    #num: number;    constructor(x: number) {        this.#num = x;    }    f(x: number, y: number): number {        switch (this.#num) {            case 1:                return x + y;            case 2:                return x * y;            case 3:                return x * x + y;            case 4:                return x + y * y;            case 5:                return x * x + y * y;            case 6:                return (x + y) * (x + y);            case 7:                return x * x * x + y * y * y;            case 8:                return x * x * y;            case 9:                return x * y * y;        }        return 0;    }}