Natural Log in JavaScript
If you need to take the natural log (a.k.a. “ln”) of a value in JavaScript, you might at first be disheartened to learn there is no such thing as Math.ln() - only Math.log(). However, if you remember way back to high school mathematics, you can use the following identity to calculate logarithms of any base via any other base:
Logb(x) = Loga(x) / Loga(b)e and the basic verson of Math.log uses a base of 10, we need to do the following:
Ln(x) = Loge(x) = Log10(x) / Log10(e)function ln(val){
return Math.log(val) / Math.log(Math.E);
}Math.log(Math.E) every time we need to take the natural log of a value:
function ln(val){
return Math.log(val) / Math.LOG10E;
}