In JavaScript, what is the difference between `.contains()` and `.includes()`?

In JavaScript, .contains() and .includes() are used for different purposes:

.contains(): This is a method of the Node interface in the Document Object Model (DOM). It’s used to check whether a node is a descendant of a given node, i.e., child, grandchild, etc.

node.contains(otherNode)

.includes(): This is a method of the Array and String prototypes in JavaScript. It’s used to determine whether an array includes a certain value among its entries or whether a string includes a certain substring.

For arrays:

array.includes(valueToFind, fromIndex)

For strings:

string.includes(searchString, position)

So, the main difference is that .contains() is used with DOM nodes, while .includes() is used with arrays and strings.