What is the use of toExponential() method in JavaScript?

The toExponential() method returns a string, with a number rounded and written using exponential notation.

A parameter defines the number of characters after the decimal point.

let a = 5.456;

console.log(a.toExponential());     // 5.456e+0  

console.log(a.toExponential(2));    // 5.46e+0

console.log(a.toExponential(4));    // 5.4560e+0

console.log(a.toExponential(6));    // 5.456000e+0