What is the use? MMMR.js is a library made to use Mean, Median, Mode, Range in Javascript with just 1 line of code. The use of MMMR(Mean, Median, Mode, Range) is essential in Machine Learning, Data Science and Many other fields of Computer Development. Many programming languages such as Python, R, etc have built in methods or libraries for this purpose but Javascript does not have any library/methods to perform MMMR(Mean, Median, Mode, Range) and programmers have to manually program MMMR(Mean, Median, Mode, Range) That is where MMMR.js comes.