Random Math Javascript

Michael Zippo 04.11.2021

👻 Check our latest review to choose the best laptop for Machine Learning engineers and Deep learning tasks!

To create a random number in Javascript, the math.random () function is used. JavaScript math.random () generates a random decimal value between 0 and 1. The function takes no arguments. To get random numbers greater than 1, simply multiply the result as needed.

In programming, there are often times when you need to get a random number. For example, you can create a puzzle and want your program to generate a random number each time the user runs the program. Or you might want to run a function a random number of times.

This is where the Math.random () JavaScript function comes in. Math.random () is a built-in method that can be used to generate random numbers in JavaScript. The function returns a value between 0 (inclusive) and 1 (excluded), but we can use another function called Math.floor () to turn our number into a random integer.

In this tutorial, we’ll explore the basics of JavaScript random number generation and discuss how you can use the Math.random () function in your code.

JavaScript Math Refresher

The JavaScript Math object provides developers with a set of mathematical functions that can be performed on numbers. These functions include returning the absolute value of a number, rounding a number, calculating the square root of a number, and more.

The Math object works with the Number data type in JavaScript. This is what the Math object looks like in a JavaScript program:

Math.functionName ();

One of the most useful functions in the Math library - and the one we’ll use later in this tutorial - is the Math.floor () function. This method can be used to return a value rounded to the nearest whole number or lower whole number. Here is an example of the Math.floor () method in action:

console.log (Math.floor (5.7));

Our code returns: 5. The number Math.floor () the processed function has been rounded to lower, that’s why our program returned "5" instead of "6".

Similarly, the Math.round () function can be used to round a number down closer Here is an example of the Math.round () function in action:

console.log (Math.round (5.7));

Our code returns: 6. The Math object includes a number of other math functions that can be used to work with numbers, but the main ones need to be known to generate a JavaScript random numbers are Math.floor () and Math.random ().

JavaScript Math.random ()

The JavaScript math.random () return and a number random between 0 (inclusive) and 1 (exclusive ). The Math.random () function returns a pseudo-random floating point number, which means it will include one decimal place. The syntax of the Math.random () method is as follows:

Math.random ();

Here is an example console.log () used to print a random number:

Our program returns:

0.022831222528214346

As you can see, our program returned a random number between zero and one. But this number is quite small, and many applications that require random numbers want to generate larger numbers. This is where the Math.floor () function comes in.

We can use the Math.floor () function to round our random number so that it becomes a random integer and we can multiply that number by generating a bigger one. Here is an example of a random number generation function in JavaScript:

Here is the result of our program after running it three times:

As you can see, our program generated a random number. In the example above, we used " * 10 " to generate a larger number. This function helps us to retrieve a number between "1" and "10." If we wanted a bigger number, we could change our multiple like this:

After running our program three times, the following numbers were generated:

So let’s say we create an addition set and we want to generate two random numbers between" 1 " and" 100 " for our additional sum to be understood. We could use the following code to generate our random numbers:

Our program returns:

What is 93 + 56 ?

In the example above, we first generated two random numbers using the Math.random () function. So, we printed a statement asking the user " What is [our first number] + [our second number] ?"

JavaScript random number between two values ‚Äã‚Äã

Math.random () doesn’t include any arguments, which means we can’t use the function to generate a number between two values. However, we can create a custom method that allows us to generate a number random between two values.

Let’s say we create an addition game that should generate two numbers between 100 and 200 for one more advanced.

When we run our program three times, the following values ‚Äã‚Äãare returned:

As you can see, our program generates random numbers between 100 and 200. Let’s analyze our program and explore how it works in more depth.

In the first line, we define a function called "generateRandomNumber ()". Our function takes two arguments: the minimum value and the maximum value of the range of numbers in which our random number is to be generated. On the next line, we use the Math.random () function to generate a random number and our "max" and "min" variables to make sure that the number that we generate falls within our range.

So in the last line, we call our generateRandomNumber () function and pass it the values ‚Äã‚Äã100 and 200. So when we run our program, a number between 100 and 200. < br>

Conclusion

The JavaScript function Math.random () can be used to generate random numbers between 0 (included ) and 1 (exclusive). Then using the Math.floor () function, we can generate larger numbers as needed.

In this tutorial, we explored the basics of the JavaScript Math library and explained how to use the Math.random () method to generate a random number. We have also created a custom function that can be used to generate a random number between two values.

You now have the knowledge to generate your own random numbers in JavaScript like an expert!