How much can a Front-end Developer learn about Machine Learning using only JavaScript?

So we don't have to construct the actual algorithms used to process data and train models. However, there's still a level of math that you have to grapple with when dabbling in Machine Learning. You need to first be able to process data to pass into ML algorithms and models. You also need to have some knowledge of ML framework settings and configuration. Most of the work done by data scientists is involved in preparing the data.