const dfd = require("danfojs-node")
​
let data = {"A": [-20.1, 30, 47.3, -20],
            "B": [34, -4, 5, 6], 
            "C": [20, -20, 30, -40]}
let df = new dfd.DataFrame(data, {index: ["a", "b", "c", "d"]})
​
console.log(df.size)
​
​

12