JavaScript Program to Get the Value of PI

In this article, we will explore various ways to get the value of π in JavaScript. The value of π (pi) is a mathematical constant representing the ratio of a circle’s circumference to its diameter. It’s approximately 3.141592653589793 and is used in various mathematical and scientific calculations.

We will explore all the above methods along with their basic implementation with the help of examples.

Approach 1: Using the Math Object

In this approach, we are using the Math object is a built-in global object that provides various mathematical functions and constants, including operations like trigonometry, logarithms, and constants like π (pi).

Syntax:

 const piValue = Math.PI;

Example: here is the basic example of using math.object.

Javascript

const piValue = Math.PI;
console.log("π (pi) Value is :", piValue);

Output

π (pi) Value is : 3.141592653589793

Apporach 2: Using Math.atan()

Javascript Math.atan( ) method is used to return the arctangent of a number in radians. The Math.atan() method returns a numeric value between -pi/2 and pi/2 radians.

Syntax:

Math.atan(value)

Example: In this example we are using the above-explained method.

Javascript

const val = 4 * (Math.atan(1));
console.log("value of π is :", val);

Output

value of π is : 3.141592653589793

Approach 3: Using for..of loop

In this approach, we use a for…of loop with an iterable sequence generated by Array(iterations).keys() to iteratively compute π by alternating fractions, enhancing readability while maintaining the original logic for increased accuracy.

Syntax:

for ( variable of iterableObjectName) {
   ...
};

Example: In this example we are using above explained approach.

Javascript

function calculatePi(iterations) {
    let pi = 0;
    let sign = 1;

    for (let i of Array(iterations).keys()) {
        pi += (4 / (2 * i + 1)) * sign;
        sign *= -1;
    }

    return pi;
}

// Increase the number of iterations
// for more accuracy
const pi = calculatePi(1000000);
console.log(pi);

Output

3.1415916535897743