How to call parent properties within an angular.forEach loop

Creating an object named "d" with properties "firstName" and "lastName":

var d={
  a:"firstName",
  b:"lastName"
};

Next, creating another object named "A" which inherits properties from object "d":

var A=Object.create(d);

console.log(A.a);//output: "firstName"
console.log(A.b);//output: "lastName"

However, when trying to view object "A" by using console.log, it returns an empty object since it doesn't display inherited properties.

This becomes a challenge when using angular.forEach.

The goal is to loop through an object, including its parent properties. How can this be achieved?

Object.create is necessary as the parent object is dynamic and may include more objects in the future, with these properties automatically reflected in the child object. Using angular.copy is not an option as it performs a deep copy, breaking the relationship between parent and child objects.

In a previous version of Google Chrome, inherited properties were visible in the console. However, after updating to version 43.0.2357.52, inherited properties are no longer shown.

Answer №1

While I'm not sure if Angular provides a built-in function for this specific task, you can achieve it using JavaScript's for-in loop:

var key;
for (key in d) {
    // The key will iterate over properties such as "firstName" and "lastName"
    // It's important to note that the order is not guaranteed
}

The for-in loop will iterate over both own properties and inherited ones.

Answer №2

The recommended approach is to utilize the angular.copy() function in order to achieve this task:

var B = angular.copy(d);

Answer №3

When using the angular.forEach method, keep in mind that it will not loop through inherited properties. Essentially, it lacks a function that allows this type of iteration.

It's important to mention that .forEach excludes inherited properties because it specifically utilizes the hasOwnProperty method... angular 1.4

If you require iteration over inherited properties, you will need to create your own custom function to handle this.

Answer №4

 var data = {name: 'John', age: 25};
var details = [];
angular.forEach(data, function(value, key) {
  this.push(key + ': ' + value);
}, details);
expect(details).toEqual(['name: John', 'age: 25']);

This particular demonstration caught my attention while browsing through the official documentation

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