N/xml Module
Node.replaceChild()
Method Description: Replaces a specific child node with another child node in a list of child nodes. If the new child node to add already exists in the list of child nodes, the node is first removed.
Returns: xml.Node
Supported Script Types: All script types For more information, see SuiteScript 2.0 Script Types.
Governance: None
Module: N/xml Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Node.replaceChild(options)

// Code Example 1

//Add additional code

//...

var replacednode = parentNode.replaceChild({

    newChild : elem[2],

    oldChild : elem[1]

});

//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_456990295409.html