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JavaScript Number Methods

The toExponential() Method

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

An optional parameter defines the number of digits behind the decimal point.

let x = 9.656;
document.getElementById("demo").innerHTML =
  x.toExponential() + "<br>" + 
  x.toExponential(2) + "<br>" + 
  x.toExponential(4) + "<br>" + 
  x.toExponential(6);