.toPrecision()

The .toPrecision() method converts a number to a string of its specificied precision form.

num.toPrecision(precision);

• precision (optional): The number of significant digits.

Converting number to a string:

const pi = 3.14159;

console.log(pi.toPrecision(5)); // Output: 3.1415
console.log(pi.toPrecision(3)); // Output: 3.14
console.log(pi.toPrecision(1)); // Output: 3

To verify if it is a string:

const pi = 3.14159;

console.log(typeof pi.toPrecision());
// Output: string

Before running the program, what do you think the result will be?

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