Number 3/3

Other Math Functions

JavaScript has a library by the name of Math that has many built-in mathematics functions and methods. Let’s look at a few of them.

Math.random():
The Math.random() is a function in JavaScript, that gives random numbers between 0 and 1 but not including 1, for example.

console.log(Math.random());


              123
            
console.log(Math.random());
console.log(Math.random());
console.log(Math.random());

As you can see we get three different numbers between 0 and 1.

Note:
You may get different output as Math.random() gives random numbers.

Math.max() and Math.min():
The Math.max() returns the greatest number of all the numbers passed in as an argument while Math.min() returns the smallest one.

console.log(Math.max(3, 5, -10, 100, 1));

console.log(Math.min(1, 2, 6, 0, -15));


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console.log(Math.max(3, 5, -10, 100, 1));
console.log(Math.min(1, 2, 6, 0, -15));

Math.pow(base, power):
The Math.pow(base, power) returns base raised to the given power, for example.

console.log(Math.pow(2, 10));


              1
            
console.log(Math.pow(2, 10));

Compito

Swipe to start coding

The task is to find the volume of a cylinder. The radius and height variables are given to storing the radius and the height of the cylinder. The formula for the volume of the cylinder is:
V = πhr²
where π is the Math PI having the value of 3.1415, r is the radius, and h is the height. Your task is to create a new const variable named PI and store 3.1415 in it and implement this formula storing the result in a variable named volume.

Soluzione

let radius = 5;

let height = 3;

let radiusSquared = Math.pow(radius, 2);

const PI = 3.1415;

volume = PI * radiusSquared * height;

console.log(volume);

Summary

JavaScript provides the facility of rounding numbers.
We can check whether a variable is finite or infinite through the isFinite() function.
We can check whether a variable is a number or not through the isNaN() function.
The Math.random() function is used to get a random numeric value from 0 to 1(excluding 1).

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Sezione 3. Capitolo 14

let radius = 5;

let height = 3;

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