3. Array dan pengulangan for (kesimpulan) : membuat game gunting kertas batu.

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#javascript #loop-for-di-javascript #array-dan-pengulangan-for

var userChoice = prompt("Do you choose rock, paper or scissors?");
var choice = ["rock", "paper", "scissors"];
if (userChoice !== choice[0]) {
    confirm("You must choose between rock, paper or scissors!");
};
var computerChoice = Math.random();
if (computerChoice < 0.34) {
	computerChoice = choice[0];
} else if(computerChoice <= 0.67) {
	computerChoice = choice[1];
} else {
	computerChoice = choice[2];
} console.log("Computer: " + computerChoice);
var compare = function(choice1, choice2) {
    if (choice1 === choice2) {
        return "The result is a tie!";
    }
    else if(choice1 === choice[0]) {
        if(choice2 === choice[2]) {
            return "rock wins";
        }
        else {
            return "paper wins";
        }
    }
    else if(choice1 === choice[1]) {
        if(choice2 === choice[0]) {
            return "paper wins";
        }
        else {
            return "scissors wins";
        }
    }
    else if(choice1 === choice[2]) {
        if(choice2 === choice[1]) {
            return "scissors wins";
        }
        else {
            return "rock wins";
        }
    }
};

compare(userChoice, computerChoice);




Saya telah membuat coding seperti diatas, saya ingin agar coding bisa mengeluarkan peringantan "You can only choose between rock, paper or scissors!" ketikan user memasukan input selain paper, rock atau scissors. Bagaimana caranya ya? lalu saya juga tidak ingin fungsi 'compare' berjalan jika input yang dimasukkan tidak benar, bagaimana caranya?

Halo coder @hirahorc. Untuk melakukan validasi input bisa dibuat seperti ini : 

var userChoice = prompt("Do you choose rock, paper or scissors?");

var choice = ["rock", "paper", "scissors"];

// Convert to lowecase
userChoice = userChoice.toLowerCase();

// Remove space
userChoice = userChoice.trim();


// Create Function
var keyExists = function(key, search) {
	    if (!search || (search.constructor !== Array && search.constructor !== Object)) {
	        return false;
	    }
	    for (var i = 0; i < search.length; i++) {
	        if (search[i] === key) {
	            return true;
	        }
	    }
	    return key in search;
	}

// Validation
if(keyExists(userChoice, choice)){
	// If existing	
} else {
       // No existing
}

Sebagai referensinya bisa dilihat disini : 

http://stackoverflow.com/questio...