$$\mathtt{\mi{Math.E}} = e \approx 2.718$$

Because E is a static property of Math, you always use it as Math.E, rather than as a property of a Math object you created (Math is not a constructor).

The following function returns e:

function getNapier() {
  return Math.E;
}

getNapier(); // 2.718281828459045

• Math.exp()
• Math.log()
• Math.log1p()