Index an array of arrays with an array of indexes

问题:

Given an array of arrays [of arrays ...] such as:

array[a][b][c][d][e]

And an array of indexes:

indexes = [ a, b, c, d, e ];

Is there an elegant way to index the array of arrays using the array of indexes?

The brute force method I am using is:

element = array[indexes[0]][indexes[1]][indexes[2]][indexes[3]][indexes[4]]

EDIT

To be clear, I would to be able to use an arbitrary array of indexes from 1 to n elements, where n is the depth of array nesting.

So given the above example of five-level nested array of arrays, and given an index array of:

indexes2 = [ a, b, c ];

I would expect to retrieve:

array[a][b][c]

回答1:

You can use Array.reduce() to go through the indexes and get the element you want.

// array[a][b][c][d][e]
var indexes = [ a, b, c, d, e ];

var element = indexes.reduce(function(prev, curr){
    return prev[curr];
}, array);