JSFiddle - React, Tailwind, and code Playground
HTML
<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>
JavaScript
const tree = [{
tagName: 't1',
children: [{
tagName: 't2',
}, {
tagName: 't3',
}],
}];
var x = _.flatMap(tree, t => t.children);
console.log(x);