this is my attempt to solve trapping water with javascript, but it fails at 319th test case, saved this just in case i feel about improving the solution later.

trapping_water.js

/**
 * @param {number[]} height
 * @return {number}
 */
var trap = function (height) {

    function measureWater(currentValue, prevItems, nextItems) {

        const lastPrev = isFinite(Math.max(...prevItems)) ? Math.max(...prevItems) : 0
        const lastNext = isFinite(Math.max(...nextItems)) ? Math.max(...nextItems) : 0

        const smallerRL = lastPrev >= lastNext ? lastNext : lastPrev

        let block = currentValue
        let water;

        if (smallerRL === 0) water = 0
        else if (smallerRL < block) water = 0
        else water = block - smallerRL

        return water
    }


    let sum = 0

    height.forEach((item, index) => {

        let nextItems = [...height].slice(index + 1, height.length);
        let prevItems;

        if (index === 0) {
            prevItems = []
        } else if (index === 1) {
            prevItems = [height[0]]
        } else if (index > 1) {
            prevItems = [...height].slice(0, index)
        }

        sum += Math.abs(measureWater(item, prevItems, nextItems))

    })

    return sum
};