.toExponential()

The .toExponential() method converts a number to a string of its exponential form.

num.toExponential(digits);

• digits (optional): The number of digits to keep after the decimal point.

Converting number to a string:

const x = 420;

console.log(x.toExponential());
// Output: 4.2e+2

To verify if it is a string:

const x = 5;

console.log(typeof x.toExponential());
// Output: string

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