npm install arraycalc
require('arraycalc');
const array = [1,2,1,3]
console.log("sum :" + array.sum());
console.log("max :" + array.max());
console.log("min :" + array.min());
console.log("avg :" + array.avg());
sum : 7
max : 3
min : 1
avg : 1.75