sort object by given key value sequence in javascript

Question

I have an array and a set of object. Unable to sort that object by given key.

var a = ['e','a','c','d','b'];
var b = {'d':'12','e':'23','c':'34','b':'45','a':'56'};
var c = {};

for(var i=0; i<a.length; i++){
    for(var j in b){
        if(a[i] == j){
            c[j]=b[j]
        }
    }
}
console.table(c);

Answer 1

It is a key-value mapping. Maintaining order in which keys are inserted defeats the benefit of O(1) insertion time.

Why would you want to sort it? If required its better to maintain an array of key-value pairs and sort them to use later. For your case,

arr = [["orange", 10],["appple", 5], ["banana", 20], ["cherry", 13]];

Use a custom sort function as

arr.sort = function(a,b) {
    return a[1]>b[1]? 1:a[1]<b[1]?-1:0;
}

Apply sort,

keysArr.sort() Traverse sorted keysArr and use elements that as a key to retrieve value.

Answer 2

Is this something you are looking for.

var a = ['e','a','c','d','b'];
var b = {'d':'12','e':'23','c':'34','b':'45','a':'56'};
var c = {};

a.forEach((val) => {
 c[val] = b[val];
});

console.log(c)