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Ridiculapp

Author: amerrycancockhold

You are viewing version 2234628. There is a newer version of this app. See the latest version of this app.

Description Source Code Launch App Current Users

There are 6 other versions of this script.

// This is a list of all possible tips that could be in the slot machine

// You would leave out ones you don't want randomly selected:
const slotMachineTips = [9,17,24,25,26, 77, 84, 85, 98, 153, 355, 499, 666];

var cdf = [];  // This is used for the "cumulative distribution" statistical function

// Run this once at the beginning of your show, or whenever you "reset" the world.
function initializeCDF() {
    var pdf = [];
    var runningTotal = 0.0;
    cdf = [];
    for (let i = 0; i < slotMachineTips.length; i++) {
        pdf.push(1/slotMachineTips[i]);    // Pr{} inversely proport to its cost
        runningTotal = runningTotal + pdf[i];
        cdf.push(runningTotal);
    }
    var accWeightedValue = 0.0;
    for (let i = 0; i < cdf.length; i++) {
        cdf[i] = cdf[i]/runningTotal;    // Normalize so last cdf=1
        pdf[i] = pdf[i]/runningTotal;    // Normalize so sum(pdf)=1
        accWeightedValue = accWeightedValue + pdf[i]*slotMachineTips[i];
    }
    // You can do with this information, whatever you like
    // I won't tell you how to price your show:
    console.log('The AVERAGE tip value of the slot machine is:', accWeightedValue);
    return cdf;
}

// Call this to select a random tip with exactly the bias dependent on its value.
// The way you currently randomize your tip menu entries would remain the same:
function pickRandomTip() {
    const random0to1 = Math.random();
    for (let i = 0; i < cdf.length; i++) {
        if (random0to1 <= cdf[i]) { // Implicitly, random0to1 > cdf[i-1]
            // So the choice of i has Pr{cdf[i] - cdf[i-1]} = pdf[i]
            return slotMachineTips[i];
        }
    }
    return 0;
}