如何使用字符串/键数组访问 object 属性？

Question

Let us consider the following array and object:

const keys = ['a', 'b', 'c'];

const object = {
  a: {
    b: {
      c: {
        data: 1
      }
    }
  }
}

Naturally, I would access the data like so:

object['a']['b']['c']

The question is, how can I access the data using the array as input? Something like:

object[...keys]

Answer 1

Probably no other way to do this

 const keys = ['a', 'b', 'c']; const object = { a: { b: { c: { data: 1 } } } } console.log(getValue(object, ...keys)) function getValue(obj, ...keys) { let current = obj for (const key of keys) { current = current[key] } return current }

Answer 2

You can loop through the keys:

 function getValueAtObjectPath(obj, path) { let val = obj; let key = path.shift(); while(key && val) { val = val[key]; key = path.shift(); }; return val; } const keys = ['a', 'b', 'c']; const object = { a: { b: { c: { data: 1 } } } } let val = getValueAtObjectPath(object, keys); console.log('value at object path: ' + JSON.stringify(val));

Return:

value at object path: {"data":1}