Angular Interview Practice

What type of data does the appendChild() method work with?

1. Only text strings

2. Only numeric values

3. Node objects

4. HTML strings

The correct answer is: Node objects

The appendChild() method is specifically designed to work with Node objects in the Document Object Model (DOM). This method allows you to attach a new child node to a specified parent node, effectively altering the structure of the document. When you call appendChild(), you pass in a Node object, which can be elements, text nodes, or comment nodes, among others. For example, if you create a new element using createElement and want to add it to an existing element in the DOM, you would use appendChild() to do so. This method not only establishes a parent-child relationship between nodes but also moves the node from its old position if it already exists in the DOM. The other options do not align with the functionality of appendChild(). Text strings and numeric values are not Node objects and would need to be converted into proper Node types (usually text nodes) before they could be added to the DOM. HTML strings are also not directly compatible; they would need to be parsed into Node objects via methods like innerHTML or DOMParser before they could be appended. Hence, the focus on Node objects makes option C the correct choice.