LeetCode 1122. Relative Sort Array — JavaScript

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https://leetcode.com/problems/relative-sort-array/description/

var relativeSortArray = function(arr1, arr2) {
    const set2 = new Set(arr2), map1 = new Map(), result = [], rest = []
    arr1.forEach(e=>{
        if (set2.has(e)) {
            map1.has(e) ? map1.set(e,map1.get(e)+1) : map1.set(e,1)
        } else {
            rest.push(e)
        }
        
    })
    rest.sort((a,b)=>a-b)
    arr2.forEach(e=>{
        if(set2.has(e)) {
            for (let i = 0; i < map1.get(e); i++) {
                result.push(e)
            }
        }
    })
    return [...result,...rest]
};

依照 arr2 來排序 arr1 ，沒被排序到的 arr element 需要從小到大排列

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