js nested if else code example

Example 1: nested if javascript

if(a == 'value'){
    doSomething();
    if(b == 'another value'){
        doAnotherThing();
    }
}

Example 2: js nested if else

var word = ['rock', 'paper', 'scissors'];

        var player1 = word[Math.floor(Math.random() * word.length)];
        var player2 = word[Math.floor(Math.random() * word.length)];

        var player1Image = document.querySelectorAll("img")[0].setAttribute("src", "images/" + player1 + ".png");
        var player2Image = document.querySelectorAll("img")[1].setAttribute("src", "images/" + player2 + ".png");
        
        if(player1 === "rock"){ // rock
            if(player2 === "scissors"){
                player1Image;
                player2Image;

                console.log(player1 + " beats " + player2 + ", player1 wins");
            } else if(player2 === "paper"){
                player1Image;
                player2Image;
                console.log(player2 + " beats " + player1 + ", player2 wins");
            } else {
                player1Image;
                player2Image;
                console.log("Draw!!!")
            }
            
        } else if(player1 === "scissors"){ // scissors
            if(player2 === "rock"){
                player1Image;
                player2Image;
                console.log(player2 + " beats " + player1 + ", player2 wins");
            } else if(player2 === "paper"){
                player1Image;
                player2Image;
                console.log(player1 + " beats " + player2 + ", player1 wins");
            } else {
                player1Image;
                player2Image;
                console.log("Draw!!!");
            }

           
        } else { // paper 
                if(player1 === "paper"){
                    if(player2 === "rock"){
                        player1Image;
                        player2Image;
                        console.log(player1 + " beats " + player2 + ", player1 wins");
                    } else if(player2 === "scissors"){
                        player1Image;
                        player2Image;
                        console.log(player2 + " beats " + player1 + ", player2 wins");
                    } else {
                        player1Image;
                        player2Image;
                        console.log("Draw!!!");
                    }
                }
        }

Example 3: better way to do nested if statements javascipt

/_ return early when invalid conditions found _/

function test(fruit, quantity) {
  const redFruits = ['apple', 'strawberry', 'cherry', 'cranberries'];

  if (!fruit) throw new Error('No fruit!'); // condition 1: throw error early
  if (!redFruits.includes(fruit)) return; // condition 2: stop when fruit is not red

  console.log('red');

  // condition 3: must be big quantity
  if (quantity > 10) {
    console.log('big quantity');
  }
}