Say I have two arrays. One is :
A = [a, b, c, d]
and another is,
B = [w, x, y, z]
Each element in A corresponds to the respective element in B
(i.e. a -> w, b -> x, c -> y, d -> z)
Now I want to sort the array A in increasing order of an attribute (say value) of the elements of B
(eg. w.value = 3, x.value = 2, y.value = 1, z.value = 4)
Hence, my desired output is:
[c, b, a, d]
How do I do this using Javascript? Any help will be appreciated. I am stuck at this for a long time.
You could get the indices, sort them with values of b and map the values of a by taking sorted indices.
var a = ['a', 'b', 'c', 'd'] ,
b = [3, 2, 1, 4],
indices = [...b.keys()].sort((x, y) => b[x] - b[y]),
result = indices.map(i => a[i]);
console.log(result);
[0, 1, 2, ..., b.length-1]; see stackoverflow.com/questions/3895478/… for more information.
keys is an iterator and to get an array, it needs a spreading into an array.To achieve expected result, use below option of using indexOf and sort
var a = ["a", "b", "c", "d"]
var b = [3, 2, 1, 4]
console.log(a.sort((x,y) => b[a.indexOf(x)] - b[a.indexOf(y)]))