How Do I Enumerate JavaScript Object Properties, Including and Excluding Inherited Properties?

Enumerating Properties of JavaScript Objects

Identifying and listing the properties of a JavaScript object is a fundamental task. In JavaScript, variables are properties of the global object, which is typically the window object. To enumerate these properties and their values, we can utilize the following approach:

for (var propertyName in myObject) {
  // propertyName is what you want
  // you can get the value like this: myObject[propertyName]
}

This method will list all the defined properties of the object, including those inherited from the object's prototype.

However, it's worth noting that this approach does not capture private variables. To filter out inherited properties and only display those defined specifically on the object, you can use the hasOwnProperty() method:

for (var propertyName in myObject) {
  if (myObject.hasOwnProperty(propertyName)) {
    // propertyName is a direct property of myObject
  }
}

The choice between these methods depends on your specific requirements and the context in which you're working.

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