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traverse and transform objects by visiting every node on a recursive walk

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#!/usr/bin/env node

'use strict';

var traverse = require('traverse');

var obj = ['five', 6, -3, [7, 8, -2, 1], { f: 10, g: -13 }];

var s = '';
traverse(obj).forEach(function toS(node) {
	if (Array.isArray(node)) {
		this.before(function () { s += '['; });
		this.post(function (child) {
			if (!child.isLast) { s += ','; }
		});
		this.after(function () { s += ']'; });
	} else if (typeof node === 'object') {
		this.before(function () { s += '{'; });
		this.pre(function (x, key) {
			toS(key);
			s += ':';
		});
		this.post(function (child) {
			if (!child.isLast) { s += ','; }
		});
		this.after(function () { s += '}'; });
	} else if (typeof node === 'string') {
		s += '"' + node.toString().replace(/"/g, '\\"') + '"';
	} else if (typeof node === 'function') {
		s += 'null';
	} else {
		s += node.toString();
	}
});

console.log('JSON.stringify: ' + JSON.stringify(obj));
console.log('this stringify: ' + s);