felthy/javascript-debug-printObject-function.js

## javascript-debug-printObject-function.js
/**
 * When investigating a selenium test failure on a remote headless browser that couldn't be reproduced
 * locally, I wanted to add some javascript to the site under test that would dump some state to the
 * page (so it could be captured by Selenium as a screenshot when the test failed). JSON.stringify()
 * didn't work because the object declared a toJSON() method, and JSON.stringify() just calls that
 * method if it's present. This was a Moment object, so toJSON() returned a string but I wanted to see
 * the internal state of the object instead.
 *
 * So, this is a rough and ready function that recursively dumps any old javascript object.
 */
function printObject(o, indent) {
    var out = '';
    if (typeof indent === 'undefined') {
        indent = 0;
    }
    for (var p in o) {
        if (o.hasOwnProperty(p)) {
            var val = o[p];
            out += new Array(4 * indent + 1).join(' ') + p + ': ';
            if (typeof val === 'object') {
                if (val instanceof Date) {
                    out += 'Date "' + val.toISOString() + '"';
                } else {
                    out += '{\n' + printObject(val, indent + 1) + new Array(4 * indent + 1).join(' ') + '}';
                }
            } else if (typeof val === 'function') {

            } else {
                out += '"' + val + '"';
            }
            out += ',\n';
        }
    }
    return out;
}
	/**
	* When investigating a selenium test failure on a remote headless browser that couldn't be reproduced
	* locally, I wanted to add some javascript to the site under test that would dump some state to the
	* page (so it could be captured by Selenium as a screenshot when the test failed). JSON.stringify()
	* didn't work because the object declared a toJSON() method, and JSON.stringify() just calls that
	* method if it's present. This was a Moment object, so toJSON() returned a string but I wanted to see
	* the internal state of the object instead.
	*
	* So, this is a rough and ready function that recursively dumps any old javascript object.
	*/
	function printObject(o, indent) {
	var out = '';
	if (typeof indent === 'undefined') {
	indent = 0;
	}
	for (var p in o) {
	if (o.hasOwnProperty(p)) {
	var val = o[p];
	out += new Array(4 * indent + 1).join(' ') + p + ': ';
	if (typeof val === 'object') {
	if (val instanceof Date) {
	out += 'Date "' + val.toISOString() + '"';
	} else {
	out += '{\n' + printObject(val, indent + 1) + new Array(4 * indent + 1).join(' ') + '}';
	}
	} else if (typeof val === 'function') {

	} else {
	out += '"' + val + '"';
	}
	out += ',\n';
	}
	}
	return out;
	}