How to use an array of keys to fetch the value from a Javascript object

Question

If there is a Javascript object with multiple levels, as in:

myObject = {
        a: 12,
        obj11: {
                obj111: \'John\',
                b         


        

Answer 1

You can do this with a reduce() one-liner. Of course if you want to wrap it in a function, you can do that too.

var myObject = {
    a: 12,
   obj11: {
           obj111: 'John',
           b:13,
           obj1111: { a:15,
                      b: 35 }
           },
   obj21: {
           a:15,
           b:16 }
}

var arr =   ['obj11','b']
var val = arr.reduce((acc,curr) => acc[curr], myObject)
console.log(val)

var arr =   ['obj11','obj1111', 'b']
var val = arr.reduce((acc,curr) => acc[curr], myObject)
console.log(val)