如何使用键数组从Javascript对象获取值

问题描述：

如果存在一个具有多个级别的Javascript对象，例如:

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

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

我想编写一个函数，将对象和键数组传递给该函数.该函数应基于这些键返回一个值.例如，传递[obj11，b]应该返回13.传递[obj11，obj1111，a]应该返回15.传递obj21应该返回对象{a:15，b:16}

I want to write a function to which is passed the object and an array of keys. The function should return a value based upon these keys. For example, passing [obj11,b] should return 13. Passing [obj11, obj1111,a] should return 15. Passing obj21 should return the object {a:15, b:16}

  function (myObj,myArr) {

      return keyVal;
  }

假设键总是正确的，谁能帮助我解决这个问题?

Assuming that the keys are always correct, can anyone help me solve this problem?

答

您可以使用键来缩小数组并将对象作为默认值.

You could reduce the array with the keys and take an object as default value.

function getValue(object, path) {
    return path.reduce(function (r, k) {
        return (r || {})[k];
    }, object);
}

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

console.log(getValue(object, ['obj11', 'b']));
console.log(getValue(object, ['obj11', 'obj1111', 'a']));
console.log(getValue(object, ['obj11', 'obj21']));

.as-console-wrapper { max-height: 100% !important; top: 0; }

如何使用键数组从Javascript对象获取值

相关推荐