Rock, Paper, Scissors, Lizard, Spock in JavaScript -


i'm kind of new javascript. started learning it, , decided make 'rock, paper, scissors, lizard, spock' game. here code: 

var userchoice = prompt("do choose rock, paper, scissors, lizard, or spock?") var computerchoice = math.random(); if (computerchoice < 0.2) {     computerchoice = "rock"; } else if (computerchoice <= 0.4) {     computerchoice = "paper"; } else if (computerchoice <= 0.6) {     computerchoice = "scissors"; } else if (computerchoice <= 0.8) {     computerchoice = "lizard"; } else {     computerchoice = "spock"; }  alert("the computer chose " + computerchoice);  var compare = function(choice1, choice2){     if (choice1 === choice2) {         alert("and... it's tie!");     }  //if user chose rock... else if (choice1 === "rock") {     if (choice2 === "scissors") {         alert("rock wins!");     } else if (choice2 === "paper") {         alert("paper wins!");     } else if (choice2 === "lizard") {         alert("rock wins!");     } else {         alert("spock wins!");     } }  //if user chose paper... else if (choice1 === "paper") {     if (choice2 === "scissors") {         alert("scissors wins!");     } else if (choice2 === "rock") {         alert("paper wins!");     } else if (choice2 === "lizard") {         alert("lizard wins!");     } else {         alert("paper wins!");     } }  //if user chose scissors... else if (choice1 === "scissors") {     if (choice2 === "paper") {         alert("scissors wins!");     } else if (choice2 === "rock") {         alert("rock wins!");     } else if (choice2 === "lizard") {         alert("scissors wins!");     } else {         alert("spock wins!");     } }  //if user chose lizard... else if (choice1 === "lizard") {     if (choice2 === "scissors") {         alert("scissors wins!");     } else if (choice2 === "rock") {         alert("rock wins!");     } else if (choice2 === "paper") {         alert("lizard wins!");     } else {         alert("lizard wins!");     } }  //if user chose spock... else if (choice1 === "spock") {     if (choice2 === "scissors") {         alert("spock wins!");     } else if (choice2 === "rock") {         alert("spock wins!");     } else if (choice2 === "lizard") {         alert("lizard wins!");     } else {         alert("paper wins!");     } } }; compare(userchoice, computerchoice);

there 2 main things want add code don't know how to:

  1. right now, if user inputs, example, 'rock' capital 'r', doesn't recognized 1 of 5 valid inputs (rock, paper, scissors, lizard, , spock). there way make if user inputs valid capital letter (or letters) still valid?

  2. i want add whenever puts in invalid (e.g. "sloth") alert them input invalid , ask them, again, put in rock, paper, scissors, lizard, or spock.

lets go object oriented on this. reduce repitition in logic:

//set choices can beat //this hash table of objects can referecne name var choices  =  {rock : {name: "rock", defeats: ["scissors","lizard"]},                  paper: {name: "paper", defeats: ["rock", "spock"]},                  scissors: {name: "scissors", defeats: ["paper", "lizard"]},                  lizard: {name: "lizard", defeats:["paper","spock"]},                  spock: {name: "spock", defeats:["scissors","rock"]}                 };   //get computers choice var computerchoice = math.random(); if (computerchoice < 0.2) {     computerchoice = "rock"; } else if (computerchoice <= 0.4) {     computerchoice = "paper"; } else if (computerchoice <= 0.6) {     computerchoice = "scissors"; } else if (computerchoice <= 0.8) {     computerchoice = "lizard"; } else {     computerchoice = "spock"; }   //get users choice, normalising lower case     var userchoice = prompt("do choose rock, paper, scissors, lizard, or spock?").tolowercase();  alert("the computer chose " + computerchoice);      //check tie if(computerchoice == userchoice){     alert("it's tie"); //check valid choice }else if(choices[userchoice] === undefined){     alert("invalid choice"); }else{     //get chosen 1 object     userchoice = choices[userchoice];        //check win     /*var victory = false;     for(var = 0; < userchoice.defeats.length; i++){         if(computerchoice == userchoice.defeats[i])         {             victory = true;             break;         }     }*/      //improved check, inspired mke spa guy     var victory = userchoice.defeats.indexof(computerchoice) > -1;      //display result     if(victory) {         alert("vitory! " + userchoice.name + " wins!")     }else{         alert("defeat, " + computerchoice + " wins!");     }    }

thats it, , spocks' uncle.

demo

demo full action : e.g: paper covers rock;

more reading:

https://developer.mozilla.org/en-us/docs/web/javascript/introduction_to_object-oriented_javascript

https://developer.mozilla.org/en-us/docs/web/javascript/guide/working_with_objects

http://www.mojavelinux.com/articles/javascript_hashes.html


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