source: node_modules/traverse/test/keys.js

'use strict';

var test = require('tape');
var traverse = require('../');

test('sort test', function (t) {
        var acc = [];
        traverse({
                a: 30,
                b: 22,
                id: 9,
        }).forEach(function (node) {
                if (!Array.isArray(node) && typeof node === 'object') {
                        this.before(function (beforeNode) {
                                this.keys = Object.keys(beforeNode);
                                this.keys.sort(function (a, b) {
                                        var aA = [a === 'id' ? 0 : 1, a];
                                        var bA = [b === 'id' ? 0 : 1, b];
                                        return aA < bA ? -1 : aA > bA ? 1 : 0;
                                });
                        });
                }
                if (this.isLeaf) { acc.push(node); }
        });

        t.equal(
                acc.join(' '),
                '9 30 22',
                'Traversal in a custom order'
        );

        t.end();
});