How to Retrieve Nested Object Values Using String Path Queries?

Retrieving Nested Object Values via String Path

Query:

How can a function elegantly extract nested object values by specifying a string path to the desired value?

Goal:

Create a function with the following desired behavior:

var obj = { foo: { bar: 'baz' } };
function(obj, "foo.bar") -> 'baz'

Solution:

To achieve this, consider leveraging the following function:

var deep_value = function(obj, path){
    var pathComponents = path.split('.');
    for (var i = 0; i < pathComponents.length; i++){
        obj = obj[pathComponents[i]];
    }
    return obj;
};

This function effectively navigates the object hierarchy, utilizing the string path as a guide, to extract the desired value.

Demonstration:

A demonstration of the function's functionality:

var obj = { foo: { bar: 'baz' } };
console.log(deep_value(obj, "foo.bar")); // Output: 'baz'

Note:

To handle scenarios where the desired value may not exist, the function can be modified to return undefined in such cases.

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