jQuery index() in vanilla javascript

Question

As per the jQuery api, the complementary operation to .get(), which accepts an index and returns a DOM node, .index() can take a DOM node and returns an index.

Answer 1

You can build your own function :

function indexInParent(node) {
    var children = node.parentNode.childNodes;
    var num = 0;
    for (var i=0; i

Demonstration (open the console)