Woch, Papye, Sizo ...

game.js

const CHOICES = ['W', 'P', 'S']
const WIN_CHOICES = ['PW', 'SP', 'WS']
let wantToContinue = true

let ordi_choice
let ordi_score = 0

let user_choice
let user_score = 0

while(wantToContinue){
    ordi_choice = CHOICES[Math.floor(Math.random() * CHOICES.length)]
    
    do{
        user_choice = prompt("Antre Chwa w la : ")
        user_choice = user_choice.toUpperCase()

        if(!CHOICES.includes(user_choice))
            alert("Ou fe yon move chwa !\nOu ka Chwazi [W], [P] oubyen [S]!\nReeseye!")
        
    } while (
        user_choice === null || 
        user_choice === undefined || 
        !CHOICES.includes(user_choice)
    )
    
    if(user_choice === ordi_choice){
        alert("Menm CHWA ... Pesonn pa genyen")
    }else{
        const result = `${user_choice}${ordi_choice}`
        console.log(result)
        if(WIN_CHOICES.includes(result)){
            user_score += 50
            ordi_score -= (ordi_score != 0 ? 50 : 0)
            alert("Bravo, Ou GENYEN !!!")
        }else{
            ordi_score += 50
            user_score -= (user_score != 0 ? 50 : 0)
            alert("Bof, Ou PEDI !!!")
        }
        alert(`Ou genyen : ${user_score} Pwen.\nOdinate a genyen : ${ordi_score} pwen.`)
    }
    
    const cont = prompt("Ou vle kontinye ? [Peze (N) pou di non]").toUpperCase()
    if(cont === "N"){
        wantToContinue = false
        alert("Mesi paske w te jwe avek nou !!!")
    }
}