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def max_by(lst, fn):
  return max(map(fn, lst))

const arrAvg = arr => arr.reduce((a,b) => a + b, 0) / arr.length
// arrAvg([20, 10, 5, 10]) -> 11.25

const arrSum = arr => arr.reduce((a,b) => a + b, 0)
// arrSum([20, 10, 5, 10]) -> 45

const arrMax = arr => Math.max(...arr);
// arrMax([20, 10, 5, 10]) -> 20

const arrMin = arr => Math.min(...arr);
// arrMin([20, 10, 5, 10]) -> 5

Returns the maximum value of a list in Python