How to check if a variable value is increasing or decreasing and show the number with what it increased or decreased

Question

This is a dumb question, And I can't believe I asked for a solution, Well now that I am pretty good I answered it. So, Firstly I create the variable number then I add two properties to it's prototype called oldValue and randomize then I set randomize to a random decimal number between 0 and 1 using Math.random(), I store the value of the number variable before any further changes, In the property I added to the prototype called oldValue, After that I check if the randomize is less than 0.5 or more than 0.5 if less then I decrement a random number between 50-100 else I increment with a number between 50-100, At last I console.log() the changes.

let number = 0;
number.__proto__.oldValue = number;
number.__proto__.randomize = 0;
let interval = setInterval(() => {
    number.__proto__.randomize = Math.random();
    let randomNumber = Math.floor(Math.random() * (100 - 50) + 50);
    number.__proto__.oldValue = number;
    if (number.randomize > 0.5) number += randomNumber;
    else number -= randomNumber;
    console.log((number - number.oldValue) < 0 ? `decrement: ${number} ${number.oldValue}` : `increment: ${number} ${number.oldValue}`);
}, 100)

Answer 1

You can store the delta in a variable. Additionally, to generate a random boolean, you only need to check if Math.random() is greater than 0.5.

var number = 0;
setInterval(() => {
  let delta = Math.floor(Math.random() * 100) * (Math.random() > .5 ? 1 : -1);
  console.log('Delta:', delta);
  number += delta;
}, 100)

Answer 2

When you are creating random number you can store it. Math.floor(Math.random() * 100)

Like this:

var number = 0;
        var randomize = 0;
        setInterval(() => {
            randomize = 0;
            randomize += Math.floor(Math.random() * 100);
            if (randomize > 50) {
                let newRandomise = Math.floor(Math.random() * 100);
                number += newRandomise

                console.log("increased by", newRandomise)
            }
            else {
                console.log("deccreased by", randomize)
                number -= Math.floor(Math.random() * 100)
            }
        }, 100)

Answer 3

Just add some console.log s that will help you

var number = 0;
var randomize = 0;
setInterval(() => {
    randomize = 0;
    randomize += Math.floor(Math.random() * 100);
    if (randomize > 50) {
        const incrementer = Math.floor(Math.random() * 100);
        console.log('Increased by', incrementer);
        number += incrementer;
    }
    else {
        const decrementer = Math.floor(Math.random() * 100);
        console.log('Decreased by', decrementer);
        number -= decrementer;
    }
}, 100)