Today is the 4th day of my #100DaysOfCode journey with JavaScript.

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This Article is a part of the JavaScript Fundamentals series.

Today, I learned about Math.random, Math.floor Functions and to call a function within our function.


In JavaScript, there are many math utilities on the Math object. To get a random number we can call the Math.random function.

const myRandomNumber = Math.random();

The above line will return some number between 0 and 1 (not including 1). Math.random can also be used to generate random numbers between the range.

Example: Inside getRandom, get a random number from the Math.random() function. Then, return that number!👇🏼

function getRandom() {
    return Math.random();

A random number between 0 and 100 could be created by simply multiplying the output:

// randomNumber will be between 0 and 100
const randomNumber = Math.random() * 100;

We could multiply and then add to get a random number between 15 and 100:

// randomNumber will be between 15 and 100
const randomNumber = (Math.random() * 85) + 15;


Math.floor takes arguments.

const two = Math.floor(2.2598223);

Math.floor function will take 2.2598223 and return 2. A number will be rounded to the nearest integer using this function. For instance, if the input was 2.9999, the method would round it to 2.

Example: Take the argument x and use Math.floor to turn it into an integer without the values after the decimal place. Once you have this floored value, return it!

function getFloor(x) {
    return Math.floor(x);


Ending with an extra bit of information about JavaScript functions…

The JavaScript Math object allows us to perform mathematical tasks on numbers. There are various math object properties.

Today I learned about Math.random, Math.floor Functions in JavaScript.

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