Console : Printing objects with more details

I scrolled through the results and see alternative solutions proposed, but it doesn't seem like anybody helped actually identify why the provided code wasn't working?

The original code mostly works, it was just a small issue with the assignment of subObject and updating the if condition. I tested the original code with this fix and it prints recursively as the OP desired

function objLoop(prop,obj){

    // ❌ SOURCE OF PROBLEM: subObject is a STRING, not an Object
    var subObject =  obj[prop].toString();

    // ✅ CORRECTION: 
    // var subObject = obj[prop]

    if(subObject.indexOf("[object Object]") !== -1){
    // ✅ CORRECTION: 
    // if (subObject) {

        line = "{\r"
        log += line;

        // ⚠️ Because you created subObject as a string, you are attempting to iterate a string rather than an object
        for (var subProperty in subObject){

            line = tabsString(2) + "*Should be printing propeties here*"
            log += line;

            line = subProperty  + "\r" + subObject.toString() + " \r";
            line = "\r" + tabsString(2) + subProperty.toString() + " : " + subObject[subProperty].toString();
            log += line;
        }
        log += "\r" + tabsString(2) + "}"
    }
};

I worked on the code of my previous answer a little bit more. I do not know why, but I cannot find a way to edit the answer... Anyway, below is my new code:

First the polyfill:

/** 
* @SEE			{@link https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/String/Trim#polyfill Polyfill}
 */

// This polyfill will be necessary below.
if (!String.prototype.trim) {
	String.prototype.trim = function () {
		return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, "");
	};
}

Then, the function to create the string:

/**
 * Creates a string from the entire object (and sub objects).
 * @9397041 {Object} obj Object to be printed in the console (keys and values).
 * @Returns {String} The formatted string of the object.
 */
function objectToString(obj, subObjTab) {
	var log;
	if (Object.prototype.toString.call(obj) === "[object Array]") {
		log = "Array " + " [\r";
	} else {
		log = obj.toString() + " {\r";
	}
	var line = "";
	tab = "    ";
	if (!subObjTab) {
		subObjTab = "";
	}
	var value;

	for (var key in obj) {
		if (typeof obj[key] === "object") {
			subObjTab = "    ";
			line = tab + key + ": ";
			line = line + objectToString(obj[key], subObjTab); // Recursion
			subObjTab = "";
			log += line;
			continue;
		}

		if (typeof obj[key] === "string") {
			line = subObjTab + tab + key + ': "' + obj[key] + '"\r';
			log += line;
			continue;
		}

		if (typeof obj[key] === "function") {
			value = obj[key].toString().trim();
			line = subObjTab + tab + key + ": " + value + "\r" + subObjTab;

			log += line;
			continue;
		}

		line = subObjTab + tab + key + ": " + obj[key] + "\r";
		log += line;
	}

	if (Object.prototype.toString.call(obj) === "[object Array]") {
		log += subObjTab + "]\r";
	} else {
		log += "}\r";
	}

	return log;
}

Then, the code that uses the function:

var myObject = {
	day: "monday",
	hour: 12,
	propertyBoolean: true,
	property_arr: ["test", 1],
	greet: function () {
		$.writeln("Hello");
	},
	subObj: {
		subObjString: "This is the sub object string property",
		subObjMethod: function () {
			$.writeln("Hello from sub object!");
		},
	},
};

$.writeln(objectToString(myObject));

And the expected result:

[object Object] {
    day: "monday"
    hour: 12
    propertyBoolean: true
    property_arr: Array  [
        0: "test"
        1: 1
    ]
    greet: function () {
		$.writeln("Hello");
	}
    subObj: [object Object] {
        subObjString: "This is the sub object string property"
        subObjMethod: function () {
			$.writeln("Hello from sub object!");
		}
    }
}

I hope this helps someone in the future. Peace.

I know I am very late to the party, but this answer may be useful for someone.

/**
 * Prints an entire object (and sub objects).
 * @param {Object} obj Object to be printed in the console (keys and values).
 * @returns Void.
 */
function printEntireObject(obj) {
	for (var key in obj) {
		if (typeof obj[key] === "object") {
			$.writeln(key + ": ");
			printEntireObject(obj[key]); // Recursion
			continue;
		}

		if (typeof obj[key] === "string") {
			$.writeln(key + ': "' + obj[key] + '"');
			continue;
		}

		$.writeln(key + ": " + obj[key]);
	}
	return;
}

var myObject = {
	day: "monday",
	hour: 12,
	greet: function () {
		$.writeln("Hello");
	},
	subObj: {
		subObjString: "This is the sub object string property",
		subObjMethod: function () {
			$.writeln("Hello from sub object!");
		},
	},
};

printEntireObject(myObject);

day: "monday"
hour: 12
greet: 

function () {

		$.writeln("Hello");

	}
subObj:
subObjString: "This is the sub object string property"
subObjMethod: 

function () {

			$.writeln("Hello from sub object!");

		}