toPrecision < Number < JavaScript

The toPrecision() method of a Number value returns a string representing the number to the specified precision.

    
    const number = 5.123456;

    console.log(number.toPrecision(5)); // "5.1235"
    console.log(number.toPrecision(2)); // "5.1"
    console.log(number.toPrecision(1)); // "5"

    const fraction = 0.0123;

    console.log(fraction.toPrecision(5)); // "0.012300"
    console.log(fraction.toPrecision(2)); // "0.012"
    console.log(fraction.toPrecision(1)); // "0.01"