Create 1619-mean-of-array-after-removing-some-elements.js

Author: everthis

1619-mean-of-array-after-removing-some-elements.js

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+/**
+ * @param {number[]} arr
+ * @return {number}
+ */
+const trimMean = function(arr) {
+  const n = arr.length
+  arr.sort((a, b) => a - b)
+  const idx = n / 20
+  let tmp = arr.slice(idx, n - idx)
+  const sum = tmp.reduce((ac, cur) => ac + cur, 0)
+  return sum / (n -idx * 2)
+};