1749-maximum-absolute-sum-of-any-subarray.js

/**
 * @param {number[]} nums
 * @return {number}
 */
const maxAbsoluteSum = function (nums) {
  let min = 0,
    max = 0,
    sum = 0
  for(let e of nums) {
    sum += e
    min = Math.min(sum, min)
    max = Math.max(sum, max)
  }
  return max - min
}

// another

/**
 * @param {number[]} nums
 * @return {number}
 */
const maxAbsoluteSum = function (nums) {
  let min = Infinity,
    max = -Infinity
  let positiveSum = 0,
    negativeSum = 0
  for (let num of nums) {
    positiveSum += num
    if (positiveSum > max) {
      max = positiveSum
    }

    if (positiveSum < 0) {
      positiveSum = 0
    }
    negativeSum += num
    if (negativeSum < min) {
      min = negativeSum
    }
    if (negativeSum > 0) {
      negativeSum = 0
    }
  }

  return Math.max(Math.abs(min), max)
}